. Elements of comparative zoology. Zoology. MOLLUSCS. 203 cavity with the outer world (fig. 41). In some these siphons may be greatly developed as long tubes and. FIG. 41.—Quahog (Venus mercenaria), with foot and siphons extended. then strong retractor muscles to draw them back are present. All of these muscles—adductors, retractors, etc. -leave their impress on the shell, so that the student, with the shell alone, may know of some •/ of the structures of the soft parts (fig. 42). Water is drawn into the mantle-cavity by means. Please note that these images are extracted from scanned page imag
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. Elements of comparative zoology. Zoology. MOLLUSCS. 203 cavity with the outer world (fig. 41). In some these siphons may be greatly developed as long tubes and. FIG. 41.—Quahog (Venus mercenaria), with foot and siphons extended. then strong retractor muscles to draw them back are present. All of these muscles—adductors, retractors, etc. -leave their impress on the shell, so that the student, with the shell alone, may know of some •/ of the structures of the soft parts (fig. 42). Water is drawn into the mantle-cavity by means. 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 work.. Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company