. The edible clams, mussels and scallops of California . Fig. 2. Pecten cir- cularis. One-half nat- ural size. Pig. 3. Saxidomus nuttalli. natural size. One - half Only one adductor muscle (the posterior) present; mantle edges not fused, hence no siphon or pallial sinus ; adults either rigidly attached, usually by shell, or entirely free and capable of swimming actively, always lying on one side, never burrowing. (See Fig. 2 ; compare with aa and Fig. 3). d. Valves unlike, the right with a deep notch, apparently a hole, for the passage of a byssus by which it is attached. Rock oysters c. Left
. The edible clams, mussels and scallops of California . Fig. 2. Pecten cir- cularis. One-half nat- ural size. Pig. 3. Saxidomus nuttalli. natural size. One - half Only one adductor muscle (the posterior) present; mantle edges not fused, hence no siphon or pallial sinus ; adults either rigidly attached, usually by shell, or entirely free and capable of swimming actively, always lying on one side, never burrowing. (See Fig. 2 ; compare with aa and Fig. 3). d. Valves unlike, the right with a deep notch, apparently a hole, for the passage of a byssus by which it is attached. Rock oysters c. Left valve with two muscle scars (adductor and byssal muscle) ; shell light but not delicate, surface of shell roughened, not translucent. Monia macroschisma p. 26 ; pi 3 , rigs. 1, 2
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishersacra, bookyear1920
