. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. FIG. 55. SCAPHOPODA-TOOTH SHFLL FIG. 56. CEPHALOPODA-SQUID Figs. 53. 54, 55, and 56.—Representatives of four of the five classes of the phylum Mollusca. See also Fig. 51 and Fig. 52. Although quite different in outward ap- pearance, all have the essential features of the phylum, viz., mantle and mantle cavity, ventral muscular foot, unsegmented bodies, and usually a shell. (Fig. 55 gready enlarged.) Class 11. AMPHiNEURA (Fig. 53). Deep marine forms. The shell when present consists of eight tr
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. FIG. 55. SCAPHOPODA-TOOTH SHFLL FIG. 56. CEPHALOPODA-SQUID Figs. 53. 54, 55, and 56.—Representatives of four of the five classes of the phylum Mollusca. See also Fig. 51 and Fig. 52. Although quite different in outward ap- pearance, all have the essential features of the phylum, viz., mantle and mantle cavity, ventral muscular foot, unsegmented bodies, and usually a shell. (Fig. 55 gready enlarged.) Class 11. AMPHiNEURA (Fig. 53). Deep marine forms. The shell when present consists of eight transverse calcareous plates. This is not a familiar form; Chiton is perhaps the most common 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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