File:The American Museum journal (c1900-(1918)) (18156351772).jpg

Title: The American Museum journal
Identifier: americanmuseumjo06amer (find matches)
Year: c1900-(1918) (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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226 THE AMERICAN MUSEUM JOURNAL gastric cavity become folded in such a manner that the radial tubes lose their radial position and open into the folds or their branches (Fig. 5, cc). The openings by which the folds com- municate with the paragastric cavity may then become narrowed and thus large irregular spaces called exhalent lacuncB (exh.) are formed, with the result that the radial tubes become mere tubular chambers (cc.) communicating at the open end with the paragastric cavity (atr.) only by the intervention of the inhalent lacunas (inh.), which in turn commiinicate with the outside by the pores. As both the inhalent and exhalent lacunas are lined
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FIG. 10.—A LARGE BAHAMAN SPONGE iHipposporgia cerebri/orniis D. & M.) with "pavement cells" (ect)) the choanocytes become restricted to the tubular flagellate chambers, as the radial tubes are now called. (c) The Rhagon Type (p. 221, Fig, 6). The two preceding types of canal arrangement are peculiar to the sponges having a calcareous or carbonate of lime skeleton. The great majority of sponges, including those having " glass " skeletons, homy skeletons or no skeletons at all, belong to the Rhagon type. In this case the flagellate chambers (cc.) are very small and numerous and, instead of being tubular, are spherical. The mesoderm varies

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