. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida. Mollusks. EAST COAST MARINE SHELLS 55 VENUS CAMPECHIENSIS Gmelln. A larger, rounder, much thicker shell than V. mer- cenarla, usually white both inside and out; lower posterior angle of the pallial line more acute, scalloping of inner margin fin- er, arrangement of cardinal teeth less fan- like. Length 4 inches. The juvenile shell is less convex than in the other species, lunule and es- cutcheon brown with fine pale zigzag lines. Inside the ma
. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida. Mollusks. EAST COAST MARINE SHELLS 55 VENUS CAMPECHIENSIS Gmelln. A larger, rounder, much thicker shell than V. mer- cenarla, usually white both inside and out; lower posterior angle of the pallial line more acute, scalloping of inner margin fin- er, arrangement of cardinal teeth less fan- like. Length 4 inches. The juvenile shell is less convex than in the other species, lunule and es- cutcheon brown with fine pale zigzag lines. Inside the margin is invariably white but occasionally in the umbones cav- ity a pale purple tinge is present. The latter is entirely absent in V. mercenaria. The brown zigzag marks are in the form of lines which in V. mercenaria are broader and inclined to be blotchy. The mutations are similar to those in V. mercenaria except that the center of the disk is never entirely smooth. Some- times a trace of purple may be found at the margin which may stjggest interbreeding with V. mercenaria. Beyond the Mississippi delta and especially in Texas this is the persistent type. It is also abundant in Yucatan. PI. SI, Fig. 2 Chesapeake Bay to Cuba; Texas; Yucatan VENDS CAMPECHIENSIS ALBORADIATA Sowerby. Brown rays on a pale ground characterize this race. Gulf of Mexico VENUS CAMPECHIENSIS QUADRATA Dall. Shell thin, small, subquadrate, uncolored. VENUS CAMPECHIENSIS TEXANA Dall. Concentric lines toward center of disk coalescent, the ribs flat-topped with polished tops; valves usually extremely convex. Texas GENUS ANOMALOCARDIA Schumacher 1817 Valves rostrate or pointed at end; inner edge crenulate; ligament exposed; three cardinal teeth in each valve; con- centric sculpture the strongest. ANOMALOCARDIA BRASILIANA Gmelln. Umbones elevated and angulated; major portion of surface smooth; posterior angle beaded in upper portion. The common Anomalocardla of the West Indies. It is very variable both in form
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmollusks
