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 



AMAUROPSIS 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 

 (Sigaretus 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 

 1.5 Inches. 



This Sinum, the commonest on the 

 east coast, lives upon the beaches. 

 PI. 35, Fig. 4 

 Lew Jersey to West Indies 



SINDM MACULATUM Say. Chestnut yellow at 

 the suture, two series of spots or macula- 

 tions upon the spire. Diameter 1.25 inches. 



Fig. 41a 

 Sinum, showing 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 1-1.5 inches. 



This species is very closely relat- 

 ed to S. maculatum. A living example has 

 been collected in Lake Worth, Florida. 



PI. 53, Fig. 18 



PI. 35, Fig. 18 



Southeast Florida to West Indies 



GENUS EUNATICINA Fischer 1885 



EUNATICINA SEMISULCATA Gray (Natica fordi- 

 ana Simp.). Umbilicus deep and wide, bound- 

 ed by an angle; whorls slantingly flat- 

 tened above; color white, shining; five to 

 six grooves encircling the shell. Length 

 14 mm. 



PI. 35, Fig. 3 



PI. 42, Fig. 17 



Jupiter Inlet and Sarasota Bay, 



Florida to West Indies 



Family Lamellariidae 



Shell small, thin, last two whorls 

 rapidly enlarging; lip thin, aperture very 

 large; surface sometimes covered with a 

 velvety epidermis; no operculum; animal 

 carnivorous. 



GENUS LAIJIELLARIA Montagu 1815 



LAMELLARIA PELLUCIDA Verrlll. Shell white, 

 very delicate, transparent, smooth; interi- 

 or of spire visible only when viewed end- 

 wise. Length 12-16 mm. 

 PI. 41, Fig. 9 



South of Martha's Vineyard to off 

 Delaware Bay; east Florida 



GENUS VELUTINA Fleming 1822 



VELUTINA LAEVIGATA Linnfe. Shell very frag- 

 ile, transparent, whorls three, the last 

 much expanded; epidermis brownish, arranged 

 in regular spiral folds; interior smooth 

 and shining; aperture almost circular; Di- 

 ameter 16 mm. 



It may be sought for among seaweed 

 upon the beaches and also in the stomachs 

 of fish. Depth range 3-50 fathoms. 



