. The edible clams, mussels and scallops of California . ii. Valves niai-ked with concentric ridges and sometinics ribs. j. No ladiating ribs, concentric ridges low, rounded, occasionally dividing into two, covered with a heavy, glossy, persistent periostracvnn ; pallial sinus reaching about half way to anterior miiscle sear; valve margin smooth; shell white. Sea cockle Ainiantes callosa p. 34 ; pi. 5 , fig. 3 jj. Radiating ribs picsent, concentric ridges not smoothly rounded n(jr dividing, with thin, grey, easily detached periostracum; pallial sinus small, not deeper than diameter of posterio
. The edible clams, mussels and scallops of California . ii. Valves niai-ked with concentric ridges and sometinics ribs. j. No ladiating ribs, concentric ridges low, rounded, occasionally dividing into two, covered with a heavy, glossy, persistent periostracvnn ; pallial sinus reaching about half way to anterior miiscle sear; valve margin smooth; shell white. Sea cockle Ainiantes callosa p. 34 ; pi. 5 , fig. 3 jj. Radiating ribs picsent, concentric ridges not smoothly rounded n(jr dividing, with thin, grey, easily detached periostracum; pallial sinus small, not deeper than diameter of posterior muscle scar; valve margin roughened; shell greyish. Hard-shell cockles Chione k. No distinct lunule or escutcheon, ribs more prominent than concentric ridges in posterior 5 of valve; pallial sinus acute. C. fluctifraoa p. 37 ; pi. 9 , fig. ] kk. Distinct lunule and escutcheon present, concentric ridges usually more prominent tlian ribs in all parts of valve; pallial sinus rounded. 1. Numerous thin, concentric ridges, ribs eveiywhere small and inconspicuous. C undatclla p. 37; pi. 9, fig. 2 1
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmollusks, bookyear192
