Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 422 AIOLLUSCA: ACEPHALA. numerous, and widely varied from one another. Some kinds have much of regularity in their outline (Figs. 620, 622). Others arrest our attention by their great irregularity of form and the peculiarities of their surface (Figs. 623, 621, 628, etc.). Most kinds have the shell well developed, but some kinds, as Teredo and Aspergillum, have the shell exceed- ingly small in comparison with the size of the animal. FIG. 625. ''Ship-worm,' Teredo norvegica, removed from its burrow. The str
Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 422 AIOLLUSCA: ACEPHALA. numerous, and widely varied from one another. Some kinds have much of regularity in their outline (Figs. 620, 622). Others arrest our attention by their great irregularity of form and the peculiarities of their surface (Figs. 623, 621, 628, etc.). Most kinds have the shell well developed, but some kinds, as Teredo and Aspergillum, have the shell exceed- ingly small in comparison with the size of the animal. FIG. 625. ''Ship-worm,' Teredo norvegica, removed from its burrow. The structure of the Acephals or Lamellibranchiates, will be better understood by referring to Figs. 618, 626-7. Internal structure of the Oyster. t>, one valve of the shell; hg. hinge; TO, one of the lobos of the mantle, and m', por ti-in of the other lobe turned upward; ms, muscles of the shell: br, branchiae or gills; m/i. mouth; t, labial tentacles; I, liver; i, intestine; a, anus; ht, heart.
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