. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 324.—Section along the line a 6 of previous figure, showing structure. and 281, pages 401 and 402) the mantle covers the inte- rior of the shell to the very edge, and forms the shell in its epidermic cells, lay- er by layer, each on the inside of the last, and extending a little be- yond it, by the growth of the animal. The successive growths are easily seen on the out- side of the shell (Fig. 323; on section, Fig. 324). If a small object like a coin be slipped between the ma
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. Fig. 324.—Section along the line a 6 of previous figure, showing structure. and 281, pages 401 and 402) the mantle covers the inte- rior of the shell to the very edge, and forms the shell in its epidermic cells, lay- er by layer, each on the inside of the last, and extending a little be- yond it, by the growth of the animal. The successive growths are easily seen on the out- side of the shell (Fig. 323; on section, Fig. 324). If a small object like a coin be slipped between the mantle and the shell it will soon be covered by a secretion from the mantle, and finally inclosed in the thickness of the shell. The subdivisions of the Acephala are seen in the shells. The Monomyaria have one muscular impression on the shell, as in the oyster; the Dim- yaria have two mus- cular impressions, as in the clam or the river-mussel, etc. The gastropod shell grows in a sim- ilar way, and the successive shell mar- gins can generally be recognized, and often form conspicu- ous ornaments on the shell. Cephalopods live, as already said, in the larger outer chamber, all the others being empty and connected with one another in the living animal by the siphuncle ( Fig. 325.—Section through a nautilus shell: ck, living chamber; ch\ empty chamber: si si, siphuncle ; s s, septa. A new septum to be formed and an extension of the outer chamber is shown by the dotted Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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