East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida eastcoastmarines00rome Year: 1937 EAST COAST MARINE SHELLS 29 Foot of animal crescent shaped; margins simple, with minute eyes. GLYCYMERIS AMERICANOS Defranee (G. undatus of authors). American Bitter-sweet. There are two sorts of modifications present in this species. One is due to variation, the other correlated with growth and senil- ity. Very young shells show indistinct sculpture, half-grown ones ribs well marked and teeth delicate. In adul
East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida eastcoastmarines00rome Year: 1937 EAST COAST MARINE SHELLS 29 Foot of animal crescent shaped; margins simple, with minute eyes. GLYCYMERIS AMERICANOS Defranee (G. undatus of authors). American Bitter-sweet. There are two sorts of modifications present in this species. One is due to variation, the other correlated with growth and senil- ity. Very young shells show indistinct sculpture, half-grown ones ribs well marked and teeth delicate. In adults the ribs be- come obscure distally, the cardinal tooth area enlarged. In senile individuals the cardinal tooth area is very large, only the teeth at the extremities of the arch re- maining and these enlarged, the concentric sciilpture strong. With these facts known the apparent great variation of the shells can be explained. Diam. 29 mm. Depth range 15-65 fathoms. PI. 2, Fig. 12 Cape Hatteras, North Carolina to the West Indies GLYCYMERIS AMERICANOS LINEATUS Reeve. Lined Bitter-sweet. This, the Antillian form is not uncommon and averages smaller than the preceding typical one. In all forms of G. americanus the reticulated sculpture is always present upon the umbones of a perfect shell, the extension of the reticulation varying with the individual. Specimens from southern waters are more swollen and brightly col- ored than northern examples. Length inches. PI. 2, Fig. 6 North Carolina to the West Indies and west to Texas GLYCYMERIS PECTINATUS Gmelln. Comb Bitter- sweet. Shell fan-shaped, solid, hardly in- flated; usually about twenty-four rounded, curved, ribs, sometimes as many as forty, crossed by fine striae; teeth feeble or ab- sent near umbones; margin of shell crenu- lated; color white, spotted with brown, sometimes in zigzag pattern. Length 20 mm. Depth range 2-175 fathoms. PI. 2, Fig. 8 PI. 64-, Fig. 16 â Cape Hatteras, North Carolina to West Indies and west to Te
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