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| Registros recuperados: 220 | |
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| Muller, J.. |
| It is well known that the main functional components of the skull in the Whalebone Whales (Mystacoceti) attain an ultimate size, which is out of normal proportion to the rest of the skeleton as compared to the proportions existing in land-mammals. As generally supposed the aquatic mode of life has greatly influenced the shape of the skull. Therefore, it is to be expected that the various species, which all have the same mode of life, show a certain amount of convergence. However, not all bones have become enlarged to the same degree; e.g., the alisphenoid and the orbitosphenoid have remained relatively small. Apparently these bones of the orbit have not been influenced by the aquatic mode of life to the same extent as is the case with other elements of the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.84. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/318263 |
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| Bouxin, H.. |
| Durant sept années, de 1933 à la guerre, j'ai observé dans la région de Concarneau (Finistère) le frai de diverses espèces de Lamellibranches marins, notamment de la moule commune, Mytilus edulis var. galloprovincialis (Lmk). Les travaux sur le frai de la moule sont extrêmement nombreux. Les auteurs qui s'en sont occupés n'ont pas eu, en général, la possibilité d'observer les émissions elle-mêmes. Ils ont dû se contenter d'en induire l'époque soit d'après l'état des glandes génitales, soit en observant la présence de larves dans le plankton, soit, enfin, d'après la possibilité de fécondations artificielles. Or, si utiles que soient des observations de ce genre, elles ne permettent d'atteindre qu'à une probabilité de circonscrire qu'une époque relativement... |
| Tipo: Text |
Palavras-chave: Reproduction; Moules; Mytilus edulis; Mytilus galloprovincialis; Larves. |
| Ano: 1954 |
URL: http://archimer.ifremer.fr/doc/00004/11489/8045.pdf |
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| Holthuis, L.B.. |
| For about half a year (February-July, 1953) Dr. M. Boeseman, curator of Fishes of the Rijksmuseum van Natuurlijke Historie, was the guest of the Instituto Tropical de Investigaciones Científicas at San Salvador. During this time Dr. Boeseman made extensive collections in numerous localities throughout the Republic of El Salvador and, though his main attention was directed towards the fishes, an interesting collection of Decapod Crustacea was collected and sent home to Leiden. This collection forms the main subject of the present paper. As Dr. G. Kruseman, curator of Insects of the Zoological Museum at Amsterdam, collected some Decapoda in the same region during his stay in El Salvador in the summer of 1952, this material also is included in the present... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.74. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/317674 |
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| Boeseman, M.. |
| A collection of Surinam fishes, all probably collected in the neighbourhood of Paramaribo during the late autumn of 1952, was kindly presented to the Rijksmuseum van Natuurlijke Historie at Leiden by the direction of the Rotterdam Zoological Garden „Blijdorp". The collection contains some 800 specimens, the examination of which yielded sufficiently interesting results to justify the present publication. Order OSTARIOPHYSOIDEA Family CHARACINIDAE Curimatopsis macrolepis Steindachner 1 ex., neighbourhood of Paramaribo, standard length 26 mm (caudal fin damaged). This species was already known from the lower regions of the Surinam River and the Marowini River. Curimatus copei Fowler Curimatus copei Fowler, 1906, p. 301, fig. 7. 1 ex., neighbourhood of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.81. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/318003 |
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| Boeseman, M.. |
| Two large specimens of a hitherto unknown species of neotropical catfish have recently been found dead and washed ashore beneath the dike along the Westerscheldt near Biezelinge, Zeeland, at a mutual distance of approximately 300 meters. Both were in excellent condition and have been presented to the Rijksmuseum van Natuurlijke Historie at Leiden by Mr. B. J. J. R. Walrecht. A superficial examination already disclosed the fact that the two specimens belong to the (sub)genus Selenaspis, a well known group of catfishes inhabiting the salt and brackish shores and estuaries of the northern part of the South American continent. Some of the species are known to spawn in fresh water. The present specimens must have been transported by ship. Whether they have been... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.81. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/318569 |
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| Docters van Leeuwen, W.M.. |
| 1 began my investigations about the galls of the Loranthaceae in Salatiga in 1908 and continued this work in Samarang from 1909 to 1915. Here I also examined the germination of the seeds. From 1915—1918 I stayed in Bandung where I had little opportunity to continue my investigations. From 1918—1932 I lived in Buitenzorg (Bogor) where I could resume my studies on the Loranthaceae, not only as to the germination of the seeds, but also the pollination of the flowers. For this purpose I sowed many species of Loranthaceae on shrubs in the neighbourhood of my home, so that I could easily check the development and had ample material at my disposal. The investigations were hampered by the chaotic conditions of the systematics of the Indomalayan Loranthaceae in... |
| Tipo: Article / Letter to the editor |
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| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/505056 |
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| Zwaan, P.C.. |
| The X-ray powder method for determining minerals has been applied to the important rock-forming mineral group of the pyroxenes in this thesis. The purpose of the investigation was to seek the relationship between the variations of the intensities and positions of the reflections in the powder diagram and the variations in optical properties and chemical composition. For that purpose a number of pyroxenes from different localities were investigated optically, chemically and röntgenographically. The orthopyroxenes. — The optical examination of the orthopyroxenes indicates, that the variation of the optical properties is related to the chemical composition (see Table 1). A difference between plutonic and volcanic orthopyroxenes lies in the size of the optic... |
| Tipo: Article / Letter to the editor |
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| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/505841 |
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| Husson, A.M.. |
| The present paper is based on a collection of bats from Tobago brought together by Mr. G. F. Mees. From July 1953 to March 1954 Mr. Mees stayed at the island of Trinidad, making occasional short visits to Tobago. Though his main attention was directed to the avifauna of these islands, he collected also several specimens of bats, those from Tobago being of special interest. The larger part of this material has been obtained by shooting. After collecting the specimens were immediately placed in a refrigerator and were sent in a frozen condition to the Leiden Museum, where they finally were prepared. I want to express here my sincere gratitude to Mr. Mees for his willingness to devote part of the time spent by him in the West Indies to the collecting of bats,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.84. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/319267 |
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| Eisner, C.. |
| Unter diesem Titel, indessen mit dem Zusatz „unter Benutzung des Materials der Kollektion Eisner, Dahlem" — die Sammlung befindet sich z.Zt. im Rijksmuseum van Natuurlijke Historie, Leiden — haben mein Freund Felix Bryk und ich die Gruppen Parnassius mnemosyne L., P. stubbendorfi Ménétr., P. eversmanni Ménétr., P. nordmanni Ménétr., P. clarius Eversm., P. clodius Ménétr., P. Orleans Ch. Oberth., P. apollonius Eversm., P. honrathi Staud. und A. Bang-Haas, P. bremeri Bremer, P. phoebus F., P. actius Eversm., P. jacquemontii Boisd., P. epaphus Ch. Oberth., P. tianschanicus Ch. Oberth., P. nomion Hb. und einen Teil von P. apollo L. kritisch bearbeitet, bis die Entwicklung der politischen Verhältnisse in Deutschland die weitere Herausgabe der „Parnassiana"... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/319187 |
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| Eisner, C.. |
| In seiner Behandlung der Gattung Archon Hb. im Tierreich „Lepidoptera pars I" kommt Bryk am Schluss seiner Betrachtungen zu der Feststellung, dass sich die geographischen „Formen" (subspecies?) in drei Gruppen zusammenfassen lassen. Unbestreitbar sind davon der „bellargus-Kreis" und der Rassenkreis, der die verschiedenen subspecies aus Pontus und Armenien beheimatet. Unklar ist die dritte Gruppe, zu der Bryk A. apollinus Herbst und subsp. thracica Buresch vereinigt. Die Diagnosen, die Bryk für die verschiedenen Rassen gibt, zwingen mich, da ich sein tiefes Wissen von allem und sein Feingefühl für alles, was mit Parnassxus zu tun hat, kenne, zu der Annahme, dass ihm ein zu beschränktes oder unzuverlässiges Material bei seiner Arbeit zu Verfügung gestanden... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/318848 |
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| Eisner, C.. |
| Viele Sammler rümpfen die Nase über die Benennung von Formen. Deren Festhaltung ist indessen wichtig, um einen Überblick über die Variabilitätsbreite einer Species zu geben ; ein weiterer Vorteil der dadurch erhaltenen Übersicht ist, dass er es dem Systematiker leichter macht, die für eine subspecies characteristischen Merkmale innerhalb der Variabilitätsmöglichkeit der species festzulegen. Aus dieser Anschauung heraus benenne ich die folgenden Formen: Luehdorfia puziloi Ersch. cf f. pallida (m.). Grundfarbe des cf weissgelb, wie sie sonst nur ? zeigen. Patria : Sutschanski-Rudnik, Ussuri, ι cf Typus. subsp. coreana Mats. f. fasciata (m.). ι cf mit im Hinterflügel einer continuierlichen Binde vom Wurzelfelde über Mittelzelle nach dem unteren Ende der... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/317923 |
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| Hooijer, D.A.. |
| CONTENTS Introduction............... 1 Celebochoerus heekereni Hooijer........... 2 Lower premolars............. 4 Upper premolars............. 9 Lower canines.............. 13 Upper canines.............. 15 Lower incisors.............. 23 Upper incisors.............. 24 Lower molars.............. 25 Upper molars.............. 30 Cranium and mandible............ 33 Postcranial skeleton............. 35 Relationships of Celebochoerus........... 38 Age and composition of the Archidiskodon-Celebochoerus fauna .... 41 References............... 42 Explanation of the plates............ 44 INTRODUCTION The very first Pleistocene vertebrate remains to be made known from the island of Celebes were two fragments of upper canines that I considered to represent a new... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.22. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/317749 |
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| Hooijer, D.A.. |
| The species mentioned in the title of the present contribution was first described on the base of two incomplete upper molars, some fragments, and two portions of limb bones (Hooijer, 1949). The two and only complete molars were described later (Hooijer, 1953a). To this has been added the description of the milk dentition and of three premolars (Hooijer, 1953c). There are, however, important lacunae in our knowledge of the molar dentition to be filled. It remains as yet uncertain whether the type upper molar of 1949 represents M2 or M3, while the smaller of the complete lower molars of 1953 could be either M1 or M2. The prolonged study of the fragmentary molars in the Celebes collection has now made it possible to assemble the full set of upper and lower... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.22; 42.84. |
| Ano: 1954 |
URL: http://www.repository.naturalis.nl/record/318545 |
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| Costa,A. S.; Grant,T. J.; Moreira,Sylvio. |
| Mudinhas novas de laranjeira azêda podem ser infetadas com o vírus da tristeza por meio do afídio vetor da moléstia ou mais fàcilmente por enxertia. Plantas adultas são muitos resistentes, quase imunes. A recuperação do vírus da tristeza de plantas de laranja azeda infetadas é efetuada com facilidade por meio de enxertia e com muita dificuldade por meio do vetor. Os sintomas comumente apresentados por mudinhas de laranja azêda afetadas, consistem em amarelecimento das fôlhas novas, paralisação no crescimento e eventual queda das fôlhas amareladas. Em caso de infecção com estirpes fracas do vírus, os sintomas são menos evidentes e comumente há recuperação. As fôlhas formadas após recuperação, muitas vêzes apresentam palidez de pequenas extensões das... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1954 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051954000100017 |
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| Registros recuperados: 220 | |
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