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| Registros recuperados: 195 | |
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| Dollfus, Robert Ph.. |
| La Biologie de ces Copépodes et leurs effets sur l'hôte ont été peu étudiés, néanmoins aucun observateur, à ma connaissance, n'a démontré que la présence de Copépodes chez un mollusque pouvait entraîner la mort de celui-ci. L'opinion générale, jusqu'à présent, était que la présence continue, la lente propagation, la dissémination de ces parasites, ne pouvait pas avoir une réelle influence sur la mortalité des hôtes. [OCR NON CONTRÔLE] |
| Tipo: Text |
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| Ano: 1951 |
URL: http://archimer.ifremer.fr/doc/1951/publication-6766.pdf |
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| Korringa, P. |
| L'industrie moulière dans les eaux zélandaises fut florissante pendant de nombreuses années. La production annuelle se montait à 50.000.000 kilos de moules (Mylilus edulis L.) destinées aux marchés; la plupart étant vendues dans leurs coquilles surtout en Belgique et en France. [OCR NON CONTRÔLE] |
| Tipo: Text |
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| Ano: 1951 |
URL: http://archimer.ifremer.fr/doc/1951/publication-6747.pdf |
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| De La Tourrasse, Guy. |
| Traditional tuna fisheries in France have been described very often and in a very good manner, and it would be superfluous to write a bibliography of the works dealing with this subject. The following few pages, resulting from observations and personal studies, aim to precise the specific and new aspect of one of these fisheries. An important share of our marine economy, they are carried out in three of the four metropolitan seas, as these fishes are not found in the English Channel; hence, from a professional point of view, three major types. |
| Tipo: Text |
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| Ano: 1951 |
URL: http://archimer.ifremer.fr/doc/1951/publication-6702.pdf |
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| Leloup, E.. |
| Le long des 60 kilomètres de la plage sablonneuse qui caractérise la côte belge, Mytilus edulis LINNÉ vit, à l'état sauvage, sur les ouvrages d'art construits par l'homme pour défendre le cordon des dunes littorales contre l'érosion de la mer. Ce mollusque recouvre les brise-lames d'un tapis uniforme d'individus serrés les uns contre les autres avec leurs siphons dirigés vers le haut. Soumises aux mouvements violents des vagues lors des marées biquotidiennes qui les couvrent et les découvrent alternativement, les moules dépassent rarement 3 cm. de longueur. Elles étaient parfois récoltées en hiver pour les mytiliculteurs hollandais qui les semaient dans les moulières de l'Escaut. Les moules s'accrochent également aux pilotis des estacades et aux blocs de... |
| Tipo: Text |
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| Ano: 1951 |
URL: http://archimer.ifremer.fr/doc/1951/publication-6764.pdf |
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| Jelgersma, H.C.. |
| The sinus rhomboidalis sacralis or sinus lumbosacralis as it is named by Ariens Kappers (1920) is an interesting anatomical part of the lumbosacral region of the avian spinal medulla. It is found in birds only and neither in reptiles nor in mammals. Fig. 1 shows the lumbosacral part of the spinal medulla of Phoenicopterus Pig. 1. Spinal medulla of Phoenicopterus, dorsal view, with sinus lumbosacralis and corpus gelatinosum. From Imhof (1905). seen from the dorsal surface and Fig. 2 represents a diagrammatic transverse section through the lumbosacral part. These figures show some peculiarities that are found in birds only. All vertebrates with hind limbs have a lumbosacral enlargement of the spinal medulla, but in birds this enlargement has become more... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.83. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/318568 |
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| Brongersma, L.D.. |
| The respiratory organs of snakes show a great diversity according to genera and species. In the Boidae (two genera excepted; cf. Brongersma, 1951 a and 1951 b), and in Xenopeltis unicolor (Reinw.) both lungs are well developed, although the left is shorter than the right (Butler, 1895). The difference in length between the right and the left lung is not the same in all genera and species, but it also shows individual variations within the species. In the Anilidae the left lung has undergone further reduction than in the Boidae; in Cylindrophis rufus (Laur.) the left lung is still rather well developed, its length is 12% of that of the right lung; in Anilius scytale (L.) the left lung is rudimentary, its length being only 3.5% of that of the right lung; in... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.82. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/317881 |
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| Broch, H.. |
| When discussing the genus Errina in my paper "Investigations on Stylasteridae (Hydrocorals),, (1942) I arrived at the conclusion held by Hickson (1912) that the species of the genus should be grouped in two, or possibly three, subgenera. It was pointed out that Hickson had erroneously used the designation "the Labiopora group" for the subgenus containing the type species Errina aspera (L.), and accordingly I proposed to name this subgenus Eu-Errina. For the other subgenus, viz., "the Errina group" of Hickson, the type species of which is Errina labiata Moseley, I introduced the name Labiata. A third group, viz., "the Spinipora group" of Hickson, was only casually mentioned by me, as I had no representative of this group at hand. The only species of this... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/318346 |
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| Junge, G.C.A.; Kooiman, J.G.. |
| The present paper deals with a collection brought together by J. G. Kooiman in 1946. After the defeat of Japan, some Dutch biologists, who during the war had worked as prisoners of war on the notorious Burma railroad, biologically explored the Khwae Noi valley. Kooiman joined this party as an ornithologist. The collection might have been larger, but shooting was limited by the exceedingly high prices of cartridges at that time. The lack of field glasses also was an inconvenience. The collection is of interest as it is the first from this part of Siam. Afterwards the collection was sent to the Rijksmuseum van Natuurlijke Historie, where it was worked out by Junge, who is responsible for the taxonomical part of the paper. Kooiman added the field notes.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.83. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/317771 |
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| Verhoeff, P.M.F.. |
| I. Grouping of European species of the genus Astata Latr. It is not my intention to anticipate in this paper a subgeneric division of the genus Astata 1). For the purpose of such division, it would be necessary to investigate more non-European material than at present is at my disposal. But at first view it seems to me that the European species may be divided into four distinct groups, which may be separated with the key given below. Two of the proposed groups (the stigma-group and the tricolor-group) form part of the subgenus Dryudella Spinola, as this subgenus has generally been understood; nevertheless, the differences between these two groups, namely in the shape of the clypeus and, in the females, in the habitus, seem to justify separating them;... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/318736 |
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| Boschma, H.. |
| During a visit to the Fiji Islands, of about three weeks in March, 1949, through the kind help of Mr. Harold Gatty at Suva I had the opportunity to make trips to various coral reefs. On one of these trips, on March 18, to the reef of Tomberua, a small island to the south east of the large island Viti Levu, I collected an extensive material of various species of the genus Montipora. Among this material there is one colony of Montipora monasteriata (Forsk.), apparently the first to be reported from the Pacific region, as Crossland (1941, p. 35) states: "It is remarkable that the species, which is not uncommon in the Red Sea, has not appeared in any collection outside this area except in Gravier's from the Gulf of Aden." Forskål's (1775) short description of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/318692 |
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| Boschma, H.. |
| I. Introduction. When using here the name Hydrocorallia for a group of corals, it is not intended to regard this group as a recognized systematic unit. Since Moseley (1880) placed the Stylasteridae with the Milleporidae in the Hydrocorallinae, a separate sub-order of the Hydroids, it has been sufficiently pointed out that the families Milleporidae and Stylasteridae have little in common, and that their respective relations are with Hydroids of systematically different groups. Broch (1914) maintains that the family Milleporidae traces its origin to that of the Corynidae, whilst in his opinion the family Stylasteridae is a highly specialized group that has been derived from the Bougainvilliidae. Stechow (1923) came to the same conclusion, he also placed the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/317782 |
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| NN. |
| In Flora Malesiana Bulletin No 8, 197-231, appeared a report on the changes in the international rules of botanical nomenclature made by the 7th Int. Bot. Congress at Stockholm (1950). Dr D.P. Rogers and Dr G.W. Martin, both members of the ad hoc Committee found some inaccuracies regarding the nomenclature of Fungi. They write: ”The multigraphed report of the Special Committee for Fungi contained numerous errors, which, because copies were furnished us very late, could not be corrected before distribution”. They are in favour of the following corrections: Rec. VIII. First sentence; after ”-phyta” insert ”(for Fungi, -mycota)”. Third sentence; after ”phytina” insert ”(for Fungi, -mycotina)”. Line ”1” under ”(b)”: delete ”(or autotrophic Thallophyta... |
| Tipo: Article / Letter to the editor |
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| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/532973 |
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| Hoedeman, J.J.. |
| Voorjaar 1949 ontving ik een kleine collectie levende vissen uit Suriname (Nederlands Guiana), door een zeeman verzameld in een poel nabij Paramaribo. Helaas is de juiste vindplaats niet nader aangegeven, dan enige kilometers ten zuiden van de hoofdstad. Onmiddellijk na ontvangst werden de vissen, die hier het onderwerp van bespreking zijn, in een groot gezelschapsaquarium (150 X 60 X 50 cm. hoog) ondergebracht, dat reeds werd bevolkt door verscheidene Nannostomini, Hasemania marginata, Rivulus cylindraceus, Acanthophthalmus kuhli, Dermogenus pusillus en Nannacara anomala en N. taenia. |
| Tipo: Article / Letter to the editor |
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| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/504706 |
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| Hoedeman, J.J.. |
| The Dwarf-cichlid genus Apistogramma, very popular among aquarists and at present among students of animal behaviour, hitherto comprises about 16 forms, several of them hardly specifically distinguished, and probably only based on stages or sexes of other species. Nevertheless I found a new form among a small collection of fresh-water fishes, imported alive by a sailor from near Paramaribo, in Dutch Guiana. I had the opportunity to keep them in an aquarium for several months, and to study their behaviour. When at last they died I tried to identify this species, and it then appeared that they were new to science. They may, however, be identical with the species described by Innes as Apistogramma U2, of which I have been unable to find a scientific... |
| Tipo: Article / Letter to the editor |
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| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/505021 |
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| Stock, J.H.. |
| In September and October 1950, Mr. C. Swaneveld, of Zierikzee, and Mr. Jac. Viergever, of Serooskerke, collected some rich samples of Copepods, found alive in the branchial sac of certain species of Tunicates. The greater part of the Tunicates belonged to the Ascidian-species Ascidiella aspersa (O. F. Müller.) The peculiar little commensal lives in the branchial cavity, often in considerable numbers, with their posterior antenna fixed to the body wall of the Ascidian. The species of the genus Notodelphys stand lowest in the scale of species adapted to this curious mode of life : I observed them moving quickly through the water outside the Tunicate, in a jumping way. Especially when the water contains little oxygen, the animals leave their host through the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/504809 |
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| Boschma, H.. |
| In Ziphioid Whales the toothrows as a rule have been subject to pronounced reduction, so that the number of teeth of fairly large size is restricted to one pair in the lower jaw. Even these often are concealed in the gum and then must be regarded as functionless, though especially in old males the tips of these teeth protrude above the gum and may be used for the capture of the prey. In many species, besides the larger teeth in the lower jaw, rows of smaller teeth have been found in both jaws, often completely hidden in the gum, sometimes with their tips protruding. In Tasmacetus shepherdi Oliver these smaller teeth are of fairly large size, they show signs of wear against their antagonists of the other jaw, indicating that here they are functional. The... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/318242 |
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| NN. |
| Dr E.D. Merrill is working on a MS index to William Jack’s papers. Mr R.D. Hoogland, Leiden, has finished his research on Dilleniaceae. The results will be embodied in a revision of the family in Flora Malesiana, a revision of Indo-Malaysian Tetracera, and a monograph of Dillenia (incl. Wormia) the latter serving as a thesis at Leiden University. He finished a revision of Malay Peninsular Argyreia and has started work on a monograph of the genus Erycibe (Convolv.). His work on Convolvulaceae is to be added to Dr S.J. van Ooststroom’s who will compile the revision of Gonvolvulaceae for Flora Malesiana. |
| Tipo: Article / Letter to the editor |
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| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/533080 |
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| Hoedeman, J.J.. |
| Among a recent importation from the Belgian Congo there was a multitude of lovely little aquariumfishes, mostly well-known to aquarists. but partly new to them, and some of these fishes even new to science. A large number of small ”Tetra’s” closely resembled the well-known species Petersius caudalis. Four perfectly preserved specimens (formol), were supplied to me by Mr. C. A. Spoelstra of Haarlem, a well-known aquarist-breeder. In order to identify this species, and designate its proper place, I started to study literature and material in the Museum. It then became evident that the classification and nomenclature of this group is far behind, a case somewhat similar to the one I recently discussed concerning the South-American Nannostomidi (Hoedeman, 1950... |
| Tipo: Article / Letter to the editor |
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| Ano: 1951 |
URL: http://www.repository.naturalis.nl/record/505046 |
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| Registros recuperados: 195 | |
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