. The edible clams, mussels and scallops of California. Mollusks; Shellfish. Fio. 4. Mania Two-thirds natural size. (A) Interior upper or left valve. (B) Interior lower or riglit valve. Left valve with four muscle scars (one atlductor. three byssal muscles) ; sliell very delicate, smooth and usually translucent, rarely taken between tides. Auoniia peruviana p. 26; pi. fif bb. Valves similar or unlike, without byssal notch. c. Shell irregular, without radiating ribs or lateral projections on either side of umbo, permanently attached by left valve; mantle without eyes;
. The edible clams, mussels and scallops of California. Mollusks; Shellfish. Fio. 4. Mania Two-thirds natural size. (A) Interior upper or left valve. (B) Interior lower or riglit valve. Left valve with four muscle scars (one atlductor. three byssal muscles) ; sliell very delicate, smooth and usually translucent, rarely taken between tides. Auoniia peruviana p. 26; pi. fif bb. Valves similar or unlike, without byssal notch. c. Shell irregular, without radiating ribs or lateral projections on either side of umbo, permanently attached by left valve; mantle without eyes; flesh white or tinged M'ith greenish ; found in colonies or masses. Oysters Ostrea P- 24 cc. Shell with radiating ribs and lateral projections or "ears"' on either side of the umbo; regular in shape and free for at least part of adult life ; margin of mantle with numerous minute eyes; flesh tinged with orange or red; found separate and free during early adult life at least. Scallops d. F'ree and regular in shape for entire life, interior of hinge area not purplish; shells light; capable of .swimming actively. Pcctcn circiilaris p. 24 ; 111. 1 , figs. 1, 2 dd. Free and regular for part only of adult life, later attached l)y right valve, which retains pattern of young free shell; interior of hinge area purplish ; shells heavy and thick. Hiniviti's gifjantens p. ; pi. 1 , fig. 3 ; pi. 2 , figs. 1, 2 aa. Two adductor mus(4es present; adult eitlier attaclied by flexible Ijyssiis, moving by means of muscular foot or burrowing, usually not lying on one side, never attached by shell (in forms here treated), nor swimming (except Solen). (See fig. 3) b. Posterior adductor large, anterior small, umbo near anterior end of shell; mantle edges fused at only one point, forming an exhalent siphonal aper- ture ; no pallial sinus ; adults attached to firm objects, or anchoi-ed in mud, by byssus, never lying on one side ; never moving when advilt; shells brown or shiny black. Mussel
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmollusks, bookyear192
