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 93 callus and interior white; operculum horny. Length 18 mm. Depth range 70-80 fathoms. It has been taken from fish stom- achs in the vicinity of Massachusetts Bay. PI, 35, Fig, 17 Greenland to North Carolina POLINICES IMMACULATA Totten. Range 5-110 fathoms. PI. 69, Fig. 20 Gulf of St. Lawrence to North Caro- lina GENUS AMAUROPSIS Morch 1857 AMADROPSIS ISLANDICA Gmelin (N. helicoides Jo
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 93 callus and interior white; operculum horny. Length 18 mm. Depth range 70-80 fathoms. It has been taken from fish stom- achs in the vicinity of Massachusetts Bay. PI, 35, Fig, 17 Greenland to North Carolina POLINICES IMMACULATA Totten. Range 5-110 fathoms. PI. 69, Fig. 20 Gulf of St. Lawrence to North Caro- lina GENUS AMAUROPSIS Morch 1857 AMADROPSIS ISLANDICA Gmelin (N. helicoides Johnston). Shell dingy white, almost smooth and with dark yellow epidermis; whorls four, suture channelled; umbilical opening very small; operculum horny. Length 1 inch or slightly more. Depth range 27- 80 fathoms. PI. 42, Fig. 14 Labrador to Georges Bank GENUS SINUM Roeding 1798 (Slgaretus Lamarck 1789) Shell depressed, spire minute, aperture extremely large; revolv- ing striae upon exterior; white, epidermis when present very thin; oper- culum minute and horny. The mantle of the animal is highly de- veloped and covers the shell into which it is incapable of withdrawing entirely. Fig. 41a. SINUM PERSPECTIVUM Say. Flatly convex, ground white, epidermis yellow- ish; covered above with waved spiral striae; base flattened. Diameter Inches. This Sinum, the commonest on the east coast, lives upon the beaches. PI. 35, Fig. 4 New Jersey to West Indies SINUM MACULATUM Say. Chestnut yellow at the suture, two series of spots or macula- tions upon the spire. Diameter inches. Fig. 41a Sinum, ahowing ani- mal, F. Foot A rare shell, more convex than the last. PI. 35, Fig. 5 North Carolina to West Indies SINUM MARTINIANUM Phil. A rather solid chestnut-brown shell; growth lines rough; epidermis thin, fading to white on base; Interior dark brown. Length Inches. This species is very closely relat- ed to S, maculatum. A living example has been collected in Lake Worth, Florida. PI.
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