. Elements of zoölogy : a textbook. Zoology. 424 MOLLL'SCA: ACEPIFALA. Mussels, etc., move by protruding the foot and then con- tracting it; and others, as t'arrft'wn, , etc., have the foot so bent that they can make short leaps. The FIG. 629. FIG. 628. Thorny Oyster, Spondylus amcularis. Mt/liliis edulis, L. Reduced Botli shores of the Atlantic Pentens (Fig. fi'22), liowever, move by opening and shutting the valves of the shell, and ejecting the water caught be- tween the valves, and thus forcing themselves along. And it should be added here, that some kinds are con- stantly fixed in
. Elements of zoölogy : a textbook. Zoology. 424 MOLLL'SCA: ACEPIFALA. Mussels, etc., move by protruding the foot and then con- tracting it; and others, as t'arrft'wn, , etc., have the foot so bent that they can make short leaps. The FIG. 629. FIG. 628. Thorny Oyster, Spondylus amcularis. Mt/liliis edulis, L. Reduced Botli shores of the Atlantic Pentens (Fig. fi'22), liowever, move by opening and shutting the valves of the shell, and ejecting the water caught be- tween the valves, and thus forcing themselves along. And it should be added here, that some kinds are con- stantly fixed in their adult state, the Sea-Mussel and Pinna being attached by threads, which they spin, and which are called a byssus (Fig. 629) ; and the Oyster and Spondylus being attached by leafy expansions, or by spines of their shell (Fig. 62S). Bivalves reproduce by means of eggs, and are exceed- ingly prolific, some kinds, as the Mussels and Oysters, FIG. 630. FIG. 631. Gastrocha>na Lam. Gahvay. Aspergillum vaginijerum, Lam. Reduced. Rsd 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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