. Elements of zoölogy : a textbook. Zoology. 420 MOLLUSC A : ACEPHALA. tightly shut by one or two strong muscles called adductors (Fig. 620, «, a'). When the animal relaxes these muscles FIG. 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
. Elements of zoölogy : a textbook. Zoology. 420 MOLLUSC A : ACEPHALA. tightly shut by one or two strong muscles called adductors (Fig. 620, «, a'). When the animal relaxes these muscles FIG. 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 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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