Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 Respiratory orifice. An AcepUal— Fresh-water Mussel. Unio complanatus, Lea, U. S. FIG. 618. Internal Structure of a Fresh-water Mussel, Unio pic/orum, L., with the right valve and niautle lobe removed. a, a, adductor muscles; p, p. pedal muscles; x, accessory pedal muscles ; it, unibo ; 7, ligament ; b, branchial orifice ; u, anal opening ; /, loot ; o, mouth ; t, tentacles or palpi.

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