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| Registros recuperados: 70 | |
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| Horst, R.. |
| On a plus écrit peut-être sur l'histoire du développement de l'huître que sur celle d'aucun autre animal invertébré.. II faut sans doute chercher la cause de ce fait dans cette particularité que l'huître fut, dès les temps les plus anciens, un des mets les plus recherchés, et que l'attention fut ainsi attirée sur le développement de cet animal. |
| Tipo: Text |
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| Ano: 1884 |
URL: http://archimer.ifremer.fr/doc/00034/14486/11787.pdf |
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| Horst, R.. |
| Though we know already a rather large number of Polychaetous Annelids from the Caribbean Sea, hitherto, as far as I know, no Annelids have been described from the coast of the island Curaçao and I therefore was very glad, that my colleague Dr. VAN DER HORST kindly placed in my hands for identification a collection of Annelids, made during his stay on that island in the summer of 1920. The worms have been collected in „de Spaansche haven”, „het Spaansche water” and the „Caracas-baai” at the South-coast of the island. Our first knowledge of the West-indian Annelids dates from the middle of the foregoing century when Oersted (1845—48), Kroyer and Schmarda travelled in Central and South America. The Annelids procured by the first two naturalists have been... |
| Tipo: Article / Letter to the editor |
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| Ano: 1922 |
URL: http://www.repository.naturalis.nl/record/504314 |
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| Horst, R.. |
| Amidst sponges, recently collected by my friend Mr. P. J. Buitendijk in the bay of Batavia, I met with a Polychaeteworm, obviously belonging to the genus Bhawania of Schmarda 1). Though I cannot give full information about its structure, because I had only a single specimen at my disposal with its head so far withdrawn that it was quite invisible, nevertheless I think the present communication not without interest, since Schmarda’s description is rather incomplete and there still reigns a good deal of uncertainty about the affinity of the paleae-bearing Polychaetae. It is a slender, flattened worm, measuring 25 mm. in length and 1½ mm. in breadth; the body is only slightly tapering at its anal extremity and has about 175 segments. Its colour is yellowish... |
| Tipo: Article / Letter to the editor |
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| Ano: 1909 |
URL: http://www.repository.naturalis.nl/record/509134 |
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| Horst, R.. |
| In my description of this large earthworm from Borneo ¹) I made already the suggestion, that the species probably did not belong to the genus Moniligaster, but I preferred to range it provisionally in this genus till we were better informed about the characters of several Moniligaster- species, only briefly described by Bourne. Since this author published a detailed account of the anatomy of Moniligaster grandis and a dozen of other species of this genus, found in S. India. They all agree in the situation of the oviducal pores between segment XI and XII and in the structure of the prostata. There now remains for me no doubt, that the Borneo-worm, which differs not only by the position of its oviducal pores upon segment XIII, but also by having a totally... |
| Tipo: Article / Letter to the editor |
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| Ano: 1896 |
URL: http://www.repository.naturalis.nl/record/509153 |
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| Horst, R.. |
| Among a number of pelagic Annelids, collected in the Malayan Archipelago by Mr. D. S. Hoedt, I met with some fragments of a Syllis-species, characterized as well by its large orange-coloured eyes, as by a series of distinct brown spots on each side of the body. The largest fragment has a length of about 13 m.m., and is composed of 47 segments; another specimen, that seems to have an anal segment, measured only 9 m.m., the number of its segments amounting to 41. The head shows a deeply notched anterior margin, and is furnished dorsally and ventrally with two eyes of considerable size, resembling those of the Alciopidae; no cephalic processes are visible, neither tentacles nor palpi. Each foot (fig. 1) presents a dorsal and a ventral cirrus. The dorsal cirri... |
| Tipo: Article / Letter to the editor |
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| Ano: 1889 |
URL: http://www.repository.naturalis.nl/record/508602 |
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| Horst, R.. |
| At the Stations 45 and 314, north off Soembawa, in a depth of 694 and 794 m, the Siboga-expedition dredged three specimens of Polynoïnae that cannot be identified with any species, hitherto described. Unfortunately they are somewhat incomplete, for the elytra as well as most of the cirri are absent. One of the specimens, a female containing ripe eggs, measures nearly 20 mm. in length and has about 40 segments. The head is rounded, broader as long, prolonged anteriorly into the two stout basal joints of the lateral antennae, that are nearly as long as the head, whereas their distal part is only a trifle longer; the species therefore belongs to the group of Lepidonotidae 1). From the middle of the head a large basal joint of the tentacle arises, but its... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1915 |
URL: http://www.repository.naturalis.nl/record/319384 |
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| Horst, R.. |
| Te midden van een tiental exemplaren van Nereis succinea Leuck., door dr. Redeke gedregd in de Zuiderzee, boven Enkhuizen, 15 Juni 1921, trof ik een geslachtsrijp ♂ aan, in heteronereis-toestand. Het exemplaar heeft een lengte van circa 30 mm., maar is niet geheel compleet. De oogen zijn vergroot en de bewapening van de slurp is normaal; alleen ontbreken de paragnathen van groep V. Slechts de voetjes van het middengedeelte van het lichaam vertoonen een epitoke wijziging. Deze begint met het 15e parapodium en strekt zich uit tot het 52e segment; de achterste parapodia stemmen geheel overeen met die van den atoken vorm (loc. cit. p. 146, fig. 3). Zooals gewoonlijk is de dorsale cirrus van de voorste 7 segmenten aan de basis aangezwollen. Bij het epitoke... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1922 |
URL: http://www.repository.naturalis.nl/record/319333 |
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| Horst, R.. |
| Lepidonotus squamatus L. juv. Waarn. 134. Enkhuizerzand. 7 Febr. 1909. Zooals vroeger door mij aangetoond, is deze soort vrij gemeen in de Zuiderzee. Eunoa nodosa M. Sars. Waarn. 16. 55° 40' N.Br., 0° 50' W.L. 8 Maart 1914. Harmothoë (Evarne) impar (Johnst.). Waarn. 69. Molengat. 16 Oct. 1913. De schubben stemmen geheel overeen met de beschrijving en afbeelding door Mc Intosh gegeven (British Annelids, p. 353, pi. XXXII, fig. 18). Nereis virens M. Sars. Waarn. 7. Vangdam. 30 Juli 1915. Slechts het vooreinde van het lichaam, uit elf segmenten bestaande, is aanwezig. ? Nereis pelagica L. Waarn. 11. St.. Abb's Head. 55° 56', 2° 3'. 11 Maart 1914. Nereis diversicolor O. F. Müll. Zuidwal in de modder, Helder. Septb. 1899. Nereis dumerilii Aud. & Edw. juv.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1920 |
URL: http://www.repository.naturalis.nl/record/318404 |
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| Horst, R.. |
| The genus Notopygos was based by Grube in 1855 ¹) on an Amphinomid worm from St. Helena, N. crinitus, especially characterized by having the anus situated dorsally at some distance from the last segment. Some time afterwards ²) he described another species, N. ornatus, from Puntarenas in Costa Rica and mentioned the presence of two dorsal cirri. Meanwhile (1857) Kinberg ³), probably unacquainted with the last named species, published a new diagnosis of the genus, in which not only the characteristical situation of the anus was not mentioned, but also added to it “cirrus dorsualis pedis unicus”. It may be presumed, that the worms collected by him in the neighbourhood of St. Helena and considered to be young specimens of N. crinitus, belonged to an other... |
| Tipo: Article / Letter to the editor |
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| Ano: 1911 |
URL: http://www.repository.naturalis.nl/record/508779 |
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| 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 |
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| Ano: 1899 |
URL: http://www.repository.naturalis.nl/record/509347 |
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| Horst, R.. |
| Among the Invertebrates collected by Büttikofer and the late Sala during their journey in Liberia 2), I found two large earthworms, belonging to the genus Acanthodrilus). Though the specimens are not very well preserved, I will describe them as good as possible, our knowledge of this interesting genus of Lumbricidae being rather scanty and only based upon the examination of four species: A. obtusus Perr. and A. ungulatus Perr. from New-Caledonia, A. verticillatus Perr. from Madagascar 4) and A. kerguelenensis R. Lank. from Kerguelen Island 5). |
| Tipo: Article / Letter to the editor |
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| Ano: 1884 |
URL: http://www.repository.naturalis.nl/record/509164 |
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| Horst, R.. |
| Alkmaria romijni n. g. n. sp. Een Terebellide. Eenigen tijd geleden ontving ik van Dr. Romijn, die bezig is met een onderzoek van de Oligochaetidae der binnenwateren van Nederland, een objectglaasje, bevattende drie kleine Anneliden uit het Alkmaarder meer, door hem verzameld in December 1914. Daar in de achterste segmenten uncini zichtbaar waren, besloot ik daaruit, dat de wormpjes jeugdige toestanden van een Terebellide moesten representeeren. Zij bezitten een koplob, van twee ronde oogvlekken voorzien, gevolgd door circa 20 lichaamsegmenten; het voorste van deze draagt twee cirrusachtige kieuwaanhangsels, terwijl de 12 volgende segmenten aan de dorsale zijde een paar bundels haarborsten vertoonen en van af het 4e borsteldragende segment tori uncinigeri... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1919 |
URL: http://www.repository.naturalis.nl/record/318667 |
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| Horst, R.. |
| Foemina: Cephalothorax divisus. Segmentum secundum et tertium inter se coalitum, alatum, elytris nullis, quartum elytris duobus maximis, segmenti genitalis rotundati, postice profunde incisi, dimidiam partem tegentibus, instructum. Pedes abdominales trium parium anteriorum ramis biarticulatis, setis plumosis instructis, quarti paris minimi, ramis uniarticulatis, setis plumosis nullis, folio dorsali nullo, Cauda biarticulata, segmento genitali fere obtecta. Fila ovigera longissima. Mas: differt a foemina magnitudine minore, figura elytrorum, praesertim pedibus abdominalibus tertii paris, hamulo magno in ramo interno instructis. |
| Tipo: Article / Letter to the editor |
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| Ano: 1897 |
URL: http://www.repository.naturalis.nl/record/508848 |
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| Horst, R.. |
| In the year 1905 Mr. J. W. van Nouhuys presented to our Museum some Nereis-specimens, collected in the Miha at the South-coast of the isle of Taliaboe, at a distance of two hours from the mouth of the river, that moreover was shut off by a bank of gravel 1). There are eleven specimens, ten females and one male, all mature and in the Heteronereisform. They are characteristically marked; in the median body-region each segment shows on it dorsal side a transverse, black band, narrow in the piddle and growing broader laterally, on the base of the parapodia. Two black spots occur on the dorsal side of each parapodium, whereas the dorsal ligule is also black coloured. Ventrally the segments show a similar marking; however on the base of the parapodium there... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1918 |
URL: http://www.repository.naturalis.nl/record/318799 |
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| Horst, R.. |
| Paralacydonia weberi n. sp. Among some Glyceridae, dredged by the Siboga-expedition at Stat. 52, south off Flores at a depth of 959 M., I met with five specimens of a Polychaet, which must be ranged among the genus Paralacydonia. This rare genus was based by Fauvel in 1913 1) on three specimens of a worm (Paralacydonia paradoxa) that holds an intermediary place between the Phyllodocidae and Nephthyidae and was found in the Mediterranean sea, south of Monaco, at a depth of about 50 M. The prostomium is conical and provided at its distal end with four bi-annular antennae; the buccal segment is without appendages. The first setigerous segment bears uniramous parapodia, whereas the following parapodia are biramous; the two lobes are separated from each other... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1923 |
URL: http://www.repository.naturalis.nl/record/318834 |
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| Horst, R.. |
| Nereis buitendijki n. sp. Malacca-strait. P. Buitendijk, 1910. Amidst the Plankton of Malacca-strait Mr. P. Buitendijk met with a small Nereis-specimen, characterized by the presence of a digitiform appendage on the dorsum of the parapodia in the posterior body-region. The worm measures about 14 mm. in length. The head is longer than broad, trapezoidal, provided with large, broad palps and two short antennae, measuring about a third of the length of the head. The tentacular cirri are rather short, the longest of them reaching about to the 6th segment. The armature of the proboscis consists of: I = 2 paragnaths, one behind the other. II = an oblique, distichous group of 10 paragnaths. IV = a transverse, tristichous group of 10 to 12 paragnaths. III = 3... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1919 |
URL: http://www.repository.naturalis.nl/record/319281 |
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| Horst, R.. |
| Nereis diversicolor O. F. Müll. Zooals te verwachten was, werd deze euryhaline soort, die in de Zuiderzee 1) algemeen verspreid is, ook hier in vrij grooten getale aangetroffen; er waren jeugdige exemplaren bij, met niet meer dan twaalf paren parapodia. Polydora hoplura Clap. 2) Te midden der bovengenoemde wormen vond ik het achtereinde van een Polydora, die in den dorsalen bundel der laatste 16 segmenten naast een of twee gewone, haarvormige borstels een groote, vischangelvormige borstel bezit; dit werd het eerst waargenomen door Claparède bij eene soort, levende in het kalkskelet van Balaniden in de Golf van Napels en door hem Polydora hoplura genoemd. Volgens Claparède komt deze haakborstel voor in de 15 achterste segmenten, terwijl Carazzi 3), die de... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1920 |
URL: http://www.repository.naturalis.nl/record/319287 |
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| 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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| 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 |
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| Ano: 1887 |
URL: http://www.repository.naturalis.nl/record/509028 |
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| 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 |
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| Ano: 1885 |
URL: http://www.repository.naturalis.nl/record/508566 |
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| Registros recuperados: 70 | |
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