. A manual of zoology. 290 MANUAL OF ZOOLOGY The foot varies in the extent of its development in the different families of the class. It usually presents an elongated, flat, ventral surface on which the animal creeps. Fig. 176. — Cypraea moneta (Cowrie). Showing the mantle, provided with marginal tentacles, partly enveloping the shell. Br, branchia; M, M, mantle; F, foot; T, tentacles at the edge of the mantle. (From Cooke, after Quoy and Gaimard.) by wave-like contractions of the muscular tissue. In the typical Gastropods the foot is usually distinguishable into three parts, a middle part or
. A manual of zoology. 290 MANUAL OF ZOOLOGY The foot varies in the extent of its development in the different families of the class. It usually presents an elongated, flat, ventral surface on which the animal creeps. Fig. 176. — Cypraea moneta (Cowrie). Showing the mantle, provided with marginal tentacles, partly enveloping the shell. Br, branchia; M, M, mantle; F, foot; T, tentacles at the edge of the mantle. (From Cooke, after Quoy and Gaimard.) by wave-like contractions of the muscular tissue. In the typical Gastropods the foot is usually distinguishable into three parts, a middle part or mesopodium which is the most. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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