. Comparative anatomy and physiology. B. Fig. 36.—Diagrams of the Typical Structure of a Mollusc. A, from above; B, from below. a, Tentacles of head ; 6, head ; c, edge of mantle ; e, outline of foot seen through the mantle, which is supposed to he transparent; /, edge of shell-follicle; g, shell; h, osphradium (Sprengel's olfactory organ); i, ctenidia (gills); k, generative orifice (paired); I, aperture of one of the nephrldia (excretory organs); m, anus; «, foot where it extends beyond the visceral mass; o, mouth ; p, plantar surface of foot. (After Ray Lankester.) and posterior; right and l
. Comparative anatomy and physiology. B. Fig. 36.—Diagrams of the Typical Structure of a Mollusc. A, from above; B, from below. a, Tentacles of head ; 6, head ; c, edge of mantle ; e, outline of foot seen through the mantle, which is supposed to he transparent; /, edge of shell-follicle; g, shell; h, osphradium (Sprengel's olfactory organ); i, ctenidia (gills); k, generative orifice (paired); I, aperture of one of the nephrldia (excretory organs); m, anus; «, foot where it extends beyond the visceral mass; o, mouth ; p, plantar surface of foot. (After Ray Lankester.) and posterior; right and left of this anal opening we find the orifices of the excretory organs (Z), and near them those of the genital ducts (&). So far the creature presents no characters other than such as we might expect to find in any co3lomate Metazoon ; in addition, there are four characters of greater significance. The ventral surface is produced into a more or less triangular muscular outgrowth, which is known as the foot; the dome-like dorsal surface, which contains the chief mass of the viscera,. 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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