Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 f S An Acephal—Clam. Mya truncata, L. Reduced one-halt'. rs, respiratory tube or siphon ; the water flows into the branchial chamber, through this tube, aud out through the excurreat siphon «s. FIG. 620. I u Dorsal margin. Anterior aide. Posterior side. Ventral margin or base. Names of the parts of a Bivalve Shell. a, place of anterior adductor muscle ; a', place of posterior adductor muscle; t, lat- eral teeth ; c, cardinal tooth ; /, lunale ; u, unibo ; /i, hinge ligament; s, sinus occu- pied by the
Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 f S An Acephal—Clam. Mya truncata, L. Reduced one-halt'. rs, respiratory tube or siphon ; the water flows into the branchial chamber, through this tube, aud out through the excurreat siphon «s. FIG. 620. I u Dorsal margin. Anterior aide. Posterior side. Ventral margin or base. Names of the parts of a Bivalve Shell. a, place of anterior adductor muscle ; a', place of posterior adductor muscle; t, lat- eral teeth ; c, cardinal tooth ; /, lunale ; u, unibo ; /i, hinge ligament; s, sinus occu- pied by the retractor muscles of the siphons; p, pallial impression or place of the attachment of the mantle. the shell is opened by an elastic pad or ligament situated at the hinge (Fig. 620, 7<). The Acephals abound in both salt and fresh waters; and living as well as dead specimens are always easily obtained for study. Every student can obtain either an Oyster
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