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Registros recuperados: 70
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A contribution to our knowlegde of the Sigalioninae Naturalis
Horst, R..
Though our knowledge of the Sigalioninae much increased in the last years thanks to the assiduous investigations of Mc Intosh, Pruvot et Racovitza 1), Darboux, Willey a. o., yet there still reigns a good deal of confusion about the exact diagnosis of the genera. Sthenelais simplex Ehl. 2) f. i. has rightly been ranged by Augener among the genus Leanira 3); Leanira Giardi Darb.4) according to the investigations of Marenzeller belongs to Sthenelais 5) and Thalenessa stylolepis Willey 6) will prove, as I presume, to be a species of Sigalion. Partly this may be ascribed to the circumstance, that only a few of the investigators could dispose of a large material and therefore must borrow their knowledge from the often inadequate descriptions of others; but it...
Tipo: Article / Letter to the editor Palavras-chave: 42.76.
Ano: 1916 URL: http://www.repository.naturalis.nl/record/319324
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A contribution towards our knowledge of the Polychaeta of South Africa Naturalis
Horst, R..
2. Nereidae 1). Nereis (Platynereis) striata (Schm.). (Mastigonereis striata Schm.). Of this species several specimens were collected in Table bay, where they were found for the first time by Schmarda 2) and afterwards met with by Willey 3). Unfortunately the description of the species is rather short and incomplete and the synonimy somewhat dubious; therefore I think it not superfluous to give a detailed account of them, especially while an epitocous male was among them. The specimens are rather small, measuring about 30 mm. in length, whereas the number of segments amounts to 70. The specimens of Schmarda and of Willey were somewhat larger, measuring 50 mm. in length, with about 80 segments. Nereis striata is characterized by a conspicuous coloration,...
Tipo: Article / Letter to the editor Palavras-chave: 42.76.
Ano: 1918 URL: http://www.repository.naturalis.nl/record/318903
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A contribution towards our knowlegde of the Polychaeta of South Africa Naturalis
Horst, R..
1. Amphinomidae and Aphroditidae. Professor Max Weber, during a short stay in South Africa in 1894, made a small collection of Annelids, which he kindly handed me over for examination. As I found among them some species, which for the first time are mentioned from this interesting region, where the fauna'sof the Atlantic and the Indo-Pacific meet each other, it will not be without interest to publish a short note about them. Euphrosyne capensis Kinb. 1). (— polybranchia Schm.) 2). At Seapoint, near low watermark, 8 specimens were collected, the largest of which has only a length of 16 mm., whereas its breadth measures 6 mm.; the number of the segments of this specimen amounts to 45. Eurythoë complanata (Pall). This species, already mentioned by Potts from...
Tipo: Article / Letter to the editor Palavras-chave: 42.76.
Ano: 1917 URL: http://www.repository.naturalis.nl/record/318068
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A new Entozoon from Struthio molybdophanes, Rchw Naturalis
Horst, R..
Examining the intestinal tract of a female of Struthio molybdophanes Rchw., died in the Zoological garden at Rotterdam , I found in both the coeca a large number of Nematoids, which I believe to represent a new species, belonging to the genus Sclerostoma Rud. The parasite is characterized as follows: Body cylindrical, transversely striated, slightly narrowed in front, attenuated gradually towards the posterior extremity, with two narrow lateral-membranes. Anterior part of the head surrounded by an annular wall. Buccal capsule with a single row of stiff cilia, surrounding the mouth and a longitudinal furrow along the middle of the dorsal side. The sub-median oral papillae are conical, the lateral ones spade-shaped. Two small, pointed neck-papillae about the...
Tipo: Article / Letter to the editor
Ano: 1885 URL: http://www.repository.naturalis.nl/record/508566
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A review of the family of Hesionidae with a description of two new species Naturalis
Horst, R..
Occupied with the examination of Hesionidae from the Dutch Eastand West-Indies I found not only, that some genera of this family are described under several different names, but also, as already stated by Webster and Benedict, that the genera seem to be badly confused 1); Leocrates Kbg. f. i. is identical with Lamprophaës Gr. and Tyrrhena Clap., and Podarke pallida was ranged by Claparède among the genus Oxydromus whereas Podarke angustifrons according to Grube belongs to the genus Irma. Partly this might be ascribed to the circumstance, that sometimes not full-grown specimens were described, partly to the fact that the cephalic appendages were overlooked, either in consequence of their minute dimension or because they were fallen off. Because in the last...
Tipo: Article / Letter to the editor Palavras-chave: 42.76.
Ano: 1921 URL: http://www.repository.naturalis.nl/record/318159
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Aspidosiphon Cylindricus, n. sp Naturalis
Horst, R..
Among a small collection of Invertebrates, recently collected by Mr. K. Schädler in the neighbourhood of Kisser, I met with a gephyrean worm, belonging to the genus Aspidosiphon. Though we know already several species of this genus from the Malay Archipelago, thanks the careful investigatons of Dr. Sluiter, during his stay at Batavia 1), the present specimen could not be identified with one of them. The body of our specimen (fig. 1) has a nearly cylindrical shape; it measures 3½ mm. in breadth, its length being about eight times greater (26 mm.). The colour of the body is brownish-yellow, that of the anal and terminal shields dark brown, almost black. In the anterior half of the trunk the body-wall is rather thick, marked by annular grooves; in its...
Tipo: Article / Letter to the editor
Ano: 1899 URL: http://www.repository.naturalis.nl/record/509347
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Bijdrage Tot de Kennis der Anneliden van de Nederlandsche Kust Naturalis
Horst, R..
In eene verzameling Anneliden, door den Heer G. J. van Oordt hoofdzakelijk in Zeeland bijeengebracht en aan 's Rijks Museum van Natuurlijke Historie geschonken, trof ik twee soorten aan, die nieuw zijn voor onze Fauna nl. Mageiona papillicornis Müll, en Spirorbis borealis Daud., terwijl de Anneliden, vroeger bestemd als Scoloplos armiger Müll, mij bleken tot de varieteit mülleri Rathke fe behooren. Scoloplos armiger Müll. var. mülleri Rathke. (Aricia mülleri Rathke). Rathke, Nova Acta Ac. Caes. Leop. Car. Nat. Curios. Dl. XX, 1843, p. 176, pl. VIII, fig. 9—15; De St. Joseph, Ann. Sc. nat. (S. 8), Dl. V, 1898, p. 356, pl. XX, fig. 167. Door de onderzoekingen van St. Joseph en Fauvel 1) is gebleken, dat Scoloplos armiger Müll., gekenmerkt door het bezit van...
Tipo: Article / Letter to the editor Palavras-chave: 42.76.
Ano: 1919 URL: http://www.repository.naturalis.nl/record/319406
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Catalogue systématique des mollusques (gastropodes prosobranches et polyplacophores) Naturalis
Horst, R.; Schepman, M.M..
La collection conchyliologique du Musée d’Histoire Naturelle des Pays-Bas est d’origine très hétérogène. Au premier lieu elle dérive du Cabinet de Zoologie, d’Anatomie Comparée et de Minéralogie de l’Université de Leide, qui surtout sous la direction du professeur Brugmans (1786—1819) s’était énormément développé¹). Une autre collection d’objets d’histoire naturelle, sous le nom de „’s Lands Cabinet” était conservée au Trippenhuis à Amsterdam. Ces collections, combinées avec le Cabinet du Prince Guillaume V et la riche collection d’Oiseaux de C. J. Temminck, forment le noyau du „Ryks Museum van Natuurlijke Historie”, institué par décret royal du 9e Août 1820. En 1822 le Musée s’enrichissait des collections, formées par le Professeur C. G. C. Reinwardt 2)...
Tipo: Article / Letter to the editor
Ano: 1908 URL: http://www.repository.naturalis.nl/record/508285
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Contributions towards the knowledge of the Annelida Polychaeta Naturalis
Horst, R..
Some time ago a finely preserved collection of Annelids was procured by our Museum from the Zoological Station at Naples; among them I observed some specimens of Arenicola, which in their characters do not agree with the species, hitherto known from the European coast. Going over the litterature about this genus, I saw that not only there reigns a good deal of confusion in the description of the different species, but that we want even an accurate knowledge of the feature of the bristles and branchiae of our European species. Almost all the authors have given an erroneous account of the appearance of the branchiae of the common A. marina; nevertheless Williams 2) in the year 1851 already stated: »they are commonly described as forming an arborescent tuft;...
Tipo: Article / Letter to the editor
Ano: 1889 URL: http://www.repository.naturalis.nl/record/508699
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Contributions towards the knowledge of the Annelida Polychaeta Naturalis
Horst, R..
The sub-genus Perinereis, according to Grube’s views, contains all Nereis-species, characterized by having the lateral dorsal paragnathi of the basal ring of the proboscis (group VI) all or some of them transverse, ridge-shaped, the remaining paragnathi being conical, or pin-shaped (»pectiniformes” Kinberg), or compressed; the feet all of the same structure, or those of the posterior region of the body more enlarged. This division mainly corresponds to Kinberg’s family Aretidea, and not to his genus Perinereis, containing the species, which have no pectiniform teeth and but little modified posterior feet. However it seems preferable to me to maintain Kinberg’s name, as I do not like to increase the systematical literature with a new one, and because the...
Tipo: Article / Letter to the editor
Ano: 1889 URL: http://www.repository.naturalis.nl/record/509452
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Contributions towards the knowledge of the Annelida Polychaeta Naturalis
Horst, R..
The publication of the »Reports on the Scientific Results of the voyage of H. M. S. Challenger” undoubtedly will mark an era in the history of our knowledge of the Invertebrate Animals. Never before in any voyage such a bulk of wellpreserved material was collected and afterwards worked out by so many distinguished investigators. In the first place this can be stated about the Annelida Polychaeta, a group usually quite neglected in preceding voyages. Though in the last decennium the number of known species much increased owing to the careful investigations of Grube 1), Marenzeller 2), Hansen 3), Langerhans 4), Théel 5), a. o., by the Report of Mr. M’Intosh on the Challenger-Annelida, lately published, our systematical knowledge of this group is largely...
Tipo: Article / Letter to the editor
Ano: 1886 URL: http://www.repository.naturalis.nl/record/509354
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Descriptions of Earthworms Naturalis
Horst, R..
Among the specimens of Ac. Büttikoferi from Liberia, described in my foregoing paper ¹), I found a number of smaller Acanthodrilidae, which at first I believed to be young individuals of the same species. However examining them more accurately, I recognized that they present some characters, which hitherto are not observed in any other species of the genus Acanthodrilus, and I have no doubt, that they belong to a new species. In honour of the Naturalist, who had done so much to increase our knowledge of the tropical Earthworms, I will name it Ac. Beddardi. The length of the largest individual is about 160 m.m. The cephalic lobe is rather long, compared to that of Ac. Büttikoferi and the setae are more projecting than in this species. The setae are arranged...
Tipo: Article / Letter to the editor
Ano: 1888 URL: http://www.repository.naturalis.nl/record/508928
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Descriptions of Earthworms Naturalis
Horst, R..
During his last journey in Liberia, my colleague Mr. Büttiköfer had the opportunity to collect a number of earthworms under a mouldering palm-tree. Among them I met with some specimens of Ac. Büttikoferi, a species which I briefly described in this Journal, Vol. VI, p. 105. However this description being based upon the examination of a single very badly preserved individual, I wish to give in the following note some illustrations and a more full account of the distinguishing characters of this species. The number of described species of Lumbricidae from all parts of the world is increasing daily, and it is a wellknown fact to every-one, dealing with this matter, that it is hardly possible to determine the systematic position of earthworms only by their...
Tipo: Article / Letter to the editor
Ano: 1887 URL: http://www.repository.naturalis.nl/record/509146
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Descriptions of Earthworms Naturalis
Horst, R..
Among the worms of our collections I met with two specimens of the genus Eudrilus, kindly presented to our Museum by Mr. C. J. Heering from Surinam. The genus Eudrilus was named by Perrier 2), who described three species: E. Lacazii (from Martinique), E. decipiens (from the Antilles) and E. peregrinus (from Rio Janeiro). Last year Mr. Beddard received from New Caledonia a dozen of earthworms, belonging to the same genus, which he named E. Boyeri 3). The genus Eudrilus, though agreeing in many characters, viz.: the arrangement of the bristles, the presence of a muscular gizzard, the form of the vascular system, with Lumbricus, is distinguished from it by the remarkable structure of its genital organs. Beddard published a careful account of the anatomy of...
Tipo: Article / Letter to the editor
Ano: 1887 URL: http://www.repository.naturalis.nl/record/508423
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Descriptions of Earthworms Naturalis
Horst, R..
Among the animals, collected by Dr. A. Vorderman in the island of Billiton 1) and presented to our Museum, I met with some earthworms belonging to the genus Perichaeta, which appear to be hitherto undescribed.
Tipo: Article / Letter to the editor
Ano: 1890 URL: http://www.repository.naturalis.nl/record/508821
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Descriptions of Earthworms Naturalis
Horst, R..
The earthworms, described in the present paper, are for the greater part collected by Dr. H. ten Kate, during his journey in the Malay Archipelago in 1891, in the isles of Flores, Timor, Samao, Groot-Bastaard and Soemba. I added the description of some other ones from Java, Sumatra and Borneo, for which I am indebted to the kindness of dr. Vorderman, dr. J. F. van Bemmelen, dr. J. G. Boerlage, dr. J. Bosscha en dr. Hagen. As could be expected, a great number of those worms belong to the genus Perichaeta. Though the discrimination of the species of this large genus is a very difficult task, I undertook to add seven new species to it, bringing the total number of Malayan Perichaeta-species up to thirty-three.
Tipo: Article / Letter to the editor
Ano: 1893 URL: http://www.repository.naturalis.nl/record/508970
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Descriptions of Earthworms Naturalis
Horst, R..
Among a lot of worms, collected in Paramaribo 1), I met with a dozen of small 2?CTiAawn'a-specimens, which cannot be identified with one of the species of this genus, described from America. The number of these species however is not very large. Rosa described a couple of them from Mexico 2) and Paragay 3), and Eisen in a recent paper on Pacific Coast Oligochaeta 4) added four new species from Mexico and California. In this plentifully illustrated memoir he not only published detailed descriptions and figures of his new species, but also of several other allied forms, making thus comparison of the different American species very easy. Though Eisen’s discovery of Benhamia-species at Miraflores »in a locality to which plants of any kind have rarely if ever...
Tipo: Article / Letter to the editor
Ano: 1899 URL: http://www.repository.naturalis.nl/record/508616
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Descriptions of Earthworms Naturalis
Horst, R..
My colleague Mr. J. Büttikofer, at this moment making part of an expedition in West-Borneo, collected on the Goenong Kenepai a large earthworm, belonging to the family of the Moniligastridae. Though our knowledge of the organisation of this interesting group much increased in the last years thanks to the careful investigations of Rosa, Beddard and Benham, there yet remain some points in their structure upon which further information is desirable; I will therefore not defer any longer to give a description of this new species, for which I propose the name of Moniligaster coeruleus.
Tipo: Article / Letter to the editor
Ano: 1895 URL: http://www.repository.naturalis.nl/record/508575
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Descriptions of Earthworms Naturalis
Horst, R..
Some time ago our Museum received from Mr. van Houten a large earthworm, found on his coffee-plantation in Tapanoeli (Sumatra). Though we know gigantic earthworms (of more than 1 M. in length) to exist in several tropical countries: Ceylon Megascolex coeruleus Templ.) 1), Cayenne (Anteus gigas Perr.) 2), Brasil ( Titanus brasiliensis Perr.) 3), Cape Colony (Microchaeta Rappi Bedd.) 4) and Australia 5), I hitherto never heard of their presence in the Malayan Archipelago. Our animal measures 1.50 M. in length; unfortunately it is not very well preserved, but rather soft and extended, so I think it will not be its exact length during its lifetime. The number of segments amounts to 443 and the body attains its greatest thickness in the anterior region, its...
Tipo: Article / Letter to the editor
Ano: 1887 URL: http://www.repository.naturalis.nl/record/509028
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Descriptions of Earthworms Naturalis
Horst, R..
Last year our Museum received a very large earthworm, collected in Brazil by Mr. H. du Dréneuf. I believe the specimen must be identified with Anteus gigas, though it does not agree in all its characters with the description given by Perrier of this species ¹). This description was based upon two specimens, one from Cayenne, the other from an unknown locality. Although our worm is not in a very good state of preservation, so that some interesting points of its organisation remained unknown to me, my examination has enabled me to add something to our rather scanty knowledge of this species, and to come to a certain conclusion about the question of its supposed identity with Microchaeta rappi. Vaillant ²) pointed out that, according to Perrier’s description,...
Tipo: Article / Letter to the editor
Ano: 1891 URL: http://www.repository.naturalis.nl/record/508829
Registros recuperados: 70
Primeira ... 1234 ... Última
 

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