Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 ACEPHALA OR LAMELLIHUANCHIATA. 427 (from the Gr. monos, one, and mus, muscle), or those whose shell is closed by one muscle, as the Oyster, etc. FIG. 645. FIG. 643. FIG. 644.

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