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  • Articles  (116,007)
  • 1925-1929
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  • 1
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    Madreporaria (1927)
    In:  Bijdragen tot de dierkunde vol. 25 no. 1, pp. 159-161
    Details
    Publication Date: 2024-01-12
    Description: As I have already pointed out in the Narrative of the Voyage (this journal Nr. 23) there is a marked difference between Caracasbay and Spanish Water, the former having clear blue ocean water, the latter being rather muddy. Spanish bay is quite the same as Caracasbay except that it is less sheltered against the tradewinds. Spanish Port is a narrow channel connecting Spanish Water with the bay and shows the transition in the different nature of the water. This difference has a great influence on the fauna as is shown especially by the coral population.\nFor the rest the coralfauna of the West Indies is extensively described by POURTAL\xc3\x88S (III. Cat. Mus. Comp. Zool. No. IV. 1871), VERRILL (Trans. Conn. Ac. Vol. 11. 1901), and VAUGHAN (The stony corals of the Porto Rican waters. U. S. Fish. Comm. Bull. Vol. 2. 1901; Some fossil corals from the elevated reefs of Cura\xc3\xa7ao, Arube and Bonaire. Samml. des geol. Reichsmus. in Leiden, 1901; Fossil corals from Central America, Cuba, and Porto Rico, with an account of the American tertiary, pleistocene, and recent coral reefs. Smiths. Inst. Bull. 103. 1919; etc.).
    Repository Name: National Museum of Natural History, Netherlands
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  • 2
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    Marine Molluscs of the Island of Cura\xc3\xa7ao (1927)
    In:  Bijdragen tot de dierkunde vol. 25 no. 1, pp. 1-36
    Details
    Publication Date: 2024-01-12
    Description: The account on West-Indian molluscs which I will give in the following pages, was started as a consequence of material, collected by Dr. J. BOEKE in the course of 1905, by Dr. C. J. VAN DER HORST during April and May of 1920 and by engineer G. J. H. MOLENGRAAFF since 1921. Besides I will mention species from Cura\xc3\xa7ao already present in the collections of the Zoological Museum at Amsterdam.\nThe majority of these species were collected alive and all of them belong to the littoral zone stretching from high-water-mark to about one fathom.
    Repository Name: National Museum of Natural History, Netherlands
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  • 3
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    Isopoda (1927)
    In:  Bijdragen tot de dierkunde vol. 25 no. 1, pp. 162-162
    Details
    Publication Date: 2024-01-12
    Description: Spanish Water, on the gills of Lutjanus chrysurus Bl., 13. IV. 20, 9 spec. \xe2\x99\x80; Caracasbay, 10. V. 20, 1 spec. \xe2\x99\x80.
    Repository Name: National Museum of Natural History, Netherlands
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  • 4
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    The Bryozoa of Cura\xc3\xa7ao (1927)
    In:  Bijdragen tot de dierkunde vol. 25 no. 1, pp. 123-132
    Details
    Publication Date: 2024-01-12
    Description: For the reason that no records for this group of animals have been made anywhere near that region, the Bryozoa collected by Dr. C. J. VAN DER HORST are of great interest. The collection is quite limited in the number of species, as might have been expected on account of the inconspicuous nature of most of them. Only the specialist in the group, accustomed to collect these minute animals and familiar with their habits of growth, occurrence and appearance, need ever expect to take a very complete series of them. Most of the species in the collection appear to be there incidentally, attached to shells, corals, etc., and were later found on close inspection. A considerable number of the species are represented by only one or two specimens and the examination of debris under the binocular microscope yielded several species in the form of minute portions of colonies. No doubt the bryozoan fauna of the waters about Cura\xc3\xa7ao includes several times as many species as appear in this report.\nIt is a typical collection of the tropical seas as far as it goes. Most of the species represented here are found in the Florida waters, where they have been recorded by SMITT (1872\xe2\x80\x9473) and OSBURN (1914). LEVINSEN (1909) has listed incidentally a few of the species for the region about the Virgin Islands (at that time the Danish West Indies). Otherwise, practically nothing is known of the Bryozoa in all that vast region which includes the West Indies, the Caribbean Sea and the Gulf of Mexico.
    Repository Name: National Museum of Natural History, Netherlands
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  • 5
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    Asteroidea (1927)
    In:  Bijdragen tot de dierkunde vol. 25 no. 1, pp. 163-163
    Details
    Publication Date: 2024-01-12
    Description: Caracasbaai, 19. IV. 20, 6 spec.
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
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    Note on Penck and Br\xc3\xbcckner\'s diagram of the fluvio-glacial series (1926)
    In:  Leidse Geologische Mededelingen vol. 2 no. 1, pp. 23-24
    Details
    Publication Date: 2024-01-12
    Description: In their classical studies on the Alpine glaciation Penck and Br\xc3\xbcckner gave a small blockdiagram to illustrate the arrangement and shape of the deposits at the lower end of a former glacier: the fluvioglacial series. This diagram has been reproduced in so many text-books, that it may be worth-while pointing out a fault in its construction.\nThe case represented by the authors is that of two terminal amphitheatres lying within eachother (fig. 1) 1). The manner in which the outer moraine with its fluvio-glacial fan of sediments is drawn in on top of the inner moraine proves it to be the younger of the two. In this case the glacier must have ridden over the inner circle, thereby destroying its ridge; but in the drawing this ridge is represented as having been left perfectly intact. On the glacier receding again the material of the older moraine would be found buried under the newer deposits, and only one frontal moraine would be left (fig. 2, A).
    Repository Name: National Museum of Natural History, Netherlands
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  • 7
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    Neue Faunen der oberen Kreide mit Hippuriten aus Nordperu (1926)
    In:  Leidse Geologische Mededelingen vol. 2 no. 1, pp. 231-241
    Details
    Publication Date: 2024-01-12
    Description: Von der \xe2\x80\x9eBataafschen Petroleum Maatschappij\xe2\x80\x9d erhielt das Leidener Museum eine reichhaltige Sammlung von Fossilien, die durch die Herren Ganz, Gsell u. Freylink in der Umgebung von Payta gesammelt worden waren. Die Fauna ist dadurch besondere interessant, dass sie einen ganz neuartigen Charakter besitzt, der von dem der bis jetzt aus S\xc3\xbcdamerika bekannten oberen Kreide stark abweicht. Da sich die endg\xc3\xbcltige Bearbeitung des umfangreichen Materials noch etwas verz\xc3\xb6gern wird, m\xc3\xb6chte ich das Vorkommen und seine Fossilf\xc3\xbchrung kurz schildern, vor allem aber die neue Pironaea-Art beschreiben, da das Auftreten dieser interessanten Gattung in S\xc3\xbcdamerika von besonderer Bedeutung ist, zumal es sich um den ersten Hippurit handelt, der aus diesem Kontinent bekannt wird.\nDie obere Kreide tritt in der Umgebung von Payta in zwei getrennten Gebieten auf. Das eine befindet sich am Westabhang der Sa. de Amotape. Die Kreide wurde dort zuerst von Bravo 1) aufgefunden und neuerdings von Iddings und Olsson 2) gegliedert. Bei Pan de Azucar und El Muerto liegen schollenf\xc3\xb6rmige Erosionsreste diskordant auf jungpalaeozoischen Schichten, die die ersten Erhebungen der Sa. de Amotape aufbauen. Ein vollst\xc3\xa4ndigeres Profil ist im Oberlauf der Quebrada Parinas aufgeschlossen, wo die Kreideschichten in einer grabenf\xc3\xb6rmigen Senke tiefer in das Gebirge eingreifen. Iddings und Olsson unterscheiden von oben nach unten:
    Repository Name: National Museum of Natural History, Netherlands
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  • 8
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    Vesuvius, the Tengger Mountains and the problem of calderas (1926)
    In:  Leidse Geologische Mededelingen vol. 2 no. 1, pp. 51-88
    Details
    Publication Date: 2024-01-12
    Description: Until recently there was no good general map of the Tengger Mountains, so that in 1914 F. von Wolff (bibl. 1) in his work \xe2\x80\x9eDer Vulkanismus\xe2\x80\x9d, vol. I, p. 510\xe2\x80\x94511, gives a reproduction of Pr. Junghuhn\'s map of 1844. For a volcanic district that has frequently been used as an example of a caldera and has been made familiar by the beautiful photographs from the firm of Kurkdjan in Soerabaya, this is an inadequate treatment, especially as Junghuhn\'s map is not accurate.\nAfter I had gained a superficial knowledge of the Tengger Mountains in two excursions in 1918 and 1919, I conceived the plan of making a new general map after the topographical map 1/20.000 of the Netherlands Indian Topographical Service. In 1922 I drew a wall-map 1/20.000 with contour distance of 100 meters, and coloured according to K. Peucker\'s method (Farbenplastik) (bibl. 2) the preparation of which occupied about a month. Plate 5 is a reduction of this map to 1/100.000, made by the firm of Smulders in the Hague, to whom a word of praise is due for the excellent way in which they have carried it out 1).
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
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    Experiments on the formation of windworn Pebbles (1928)
    In:  Leidse Geologische Mededelingen vol. 3 no. 1, pp. 17-38
    Details
    Publication Date: 2024-01-12
    Description: The influence of the wind laden with sand in modelling pebbles is believed by some authors to be only that of polishing the surface, by others of rounding off bits of stone that already possessed edges and corners, or again by others of wearing any fragment either rounded or angular into definite forms with ridges and facets, dependent on the shape of the basis (Alb. Heim). Experiments, fully confirming the last opinion, are described in this paper: no rounding off took place, while the models were slowly revolved in the sandblast, and vertical planes took on a backward slanting position, cutting eachother along sharp edges. Where sand corrosion is great, as in the desert, the windworn pebbles owe their shape to the laws formulated by Heim; many of the fossil windworn pebbles of Northern Europe have undergone but slight alteration from their original shape and size by the natural sandblast, others seem to have been entirely remodelled by the wind along the lines indicated above.
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
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    \xc3\x9cber einige fossile H\xc3\xb6lzer aus Java (1926)
    In:  Leidse Geologische Mededelingen vol. 2 no. 1, pp. 1-6
    Details
    Publication Date: 2024-01-12
    Description: Da die Originale der von G\xc3\xb6ppert aus dem Terti\xc3\xa4r von Java beschriebenen Arten Piperites Hasskarlianus und Junghuhnites javanicus nicht mehr vorhanden sind, die vorliegenden Beschreibungen f\xc3\xbcr eine Bestimmung aber nicht ausreichen, so sind sie aus der fossilen Flora Javas zu streichen. Das gilt auch von Miquelites elegans, dessen schlechte Erhaltung eine sichere Bestimmung unm\xc3\xb6glich macht. Bredaea moroides dagegen ist ebenso wie Naucleoxylon spectabile Cri\xc3\xa9 sowie ein bisher unbeschriebenes Kieselholz von Java eine Dipterocarpacee. Die St\xc3\xbccke werden beschrieben als Dipterocarpoxylon moroides, D. spectabile und D. G\xc3\xb6pperti n. sp. Die Frage, ob es m\xc3\xb6glich ist, diese wie andere fossile Dipterocarpoxyla bestimmten rezenten Dipterocarpaceengattungen zuzuweisen, soll sp\xc3\xa4ter er\xc3\xb6rtert werden.\nFrankfurt a/M. Geologisch-Pal\xc3\xa4ontologisches Institut der Universit\xc3\xa4t.
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