. Animal physiology. Physiology, Comparative; Physiology, Comparative. GENERAL STRUCTURE OF CRUSTACEA. 89 the abdomen; a n, the termination of the intestine; /, the spinnerets; o, the ovaries ; and o r, the opening of the oviduct. 107. The class of Crustacea, of which the crab, lobster, and crayfish are the best known forms, differs from both the preceding, in being adapted to breathe by means of gills, and thus to reside in or near water, instead of being tenants of the air. Moreover the body is enclosed in a hard covering, which generally contains a good deal of carbonate of lime, and which
. Animal physiology. Physiology, Comparative; Physiology, Comparative. GENERAL STRUCTURE OF CRUSTACEA. 89 the abdomen; a n, the termination of the intestine; /, the spinnerets; o, the ovaries ; and o r, the opening of the oviduct. 107. The class of Crustacea, of which the crab, lobster, and crayfish are the best known forms, differs from both the preceding, in being adapted to breathe by means of gills, and thus to reside in or near water, instead of being tenants of the air. Moreover the body is enclosed in a hard covering, which generally contains a good deal of carbonate of lime, and which is thrown off at regular intervals. This covering also encloses the members, which are never less than. Fig. 47 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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