File:The royal natural history (1893) (14758731276).jpg

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Identifier: royalnaturalhist612lyde (find matches)
Title: The royal natural history
Year: 1893 (1890s)
Authors: Lydekker, Richard, 1849-1915 Sclater, Philip Lutley, 1829-1913 Frostick, W. B., former owner. DSI Brooks, W. T., former owner. DSI
Subjects: Zoology Natural history
Publisher: London and New York : Frederick Warne & Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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A CALCAREOUS LEUCON SPONGE, Leucandra (uat. size). 536 SPONGES. prismatic cells, each carrying a vibratile flagellum. The hinder end is composed ofa smaller number of large rounded granular cells without flagella. After the larva has swum about for a time, it becomes broader in theequatorial zone (6). The fore-half broadens out more and more till it forms aflat lid on the hinder hemisphere. Finally, the small cells lose their cilia andbecome completely invaginated into the interior of the large-celled hemisphere,which now resembles a cup with a double wall (c). There are thirteen British species of Calcarea, and over two hundred from all w/)\wm
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development OP Sycon raphanus (all figures enlarged). parts of the world. They are almost confined to shallow water, the greatest depthfrom which they have been obtained being four hundred and fifty fathoms.Calcareous sponges prefer shade and avoid light, and are chiefly found in caves,under stones, in shells, or in the shade of dense thickets of seaweed. Six-Rayed, or Glass-Sponges,—Class Hexactinellida. In the sponges of this group the skeleton is built of spicules with three axesand six rays, intersecting one another at right angles through a common centre.A second characteristic consists in the comparatively simple arrangement and large

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30 July 2014



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