EAST COAST MARINE SHELLS 



91 



A larger shell than the typical, whorls 

 more inflated and rounded, fine spiral 

 sculpture more developed. Length 5.6 mm. 



PI. 34, Fig. 12 



Sheepscott River, Wiscasset, Maine 



ODOSTOMIA MODESTA Stimpson. A shining, 

 yellowish white shell; sutures well im- 

 pressed; base inflated; rounded fine growth 

 lines and faint spiral striations. Length 

 3.2 mm., diameter 1.8 mm. 



PI. 34, Fig. 10 



Wood's Hole, Massachusetts 



Family Carinariidae 



Shell very delicate, symmetrical, 

 glassy. 



Animal large, translucent, granu- 

 lated; tentacles long and slender, eyes 

 near their base. It is an oceanic swimmer, 

 very agile, and propelled with a ventral 

 fin. 



GENUS CARINARIA Lamarck 1801 

 (KEELED PAPER SHELLS) 



CARINARIA MEDITERRANEA Peron and Le Sueur. 

 The animal is a gelatinous mass, swollen, 

 transparent but with a well-developed head. 

 It is provided with a sucker for attachment 

 to any solid object when at rest. The cup- 

 shaped shell, much smaller than the animal, 

 is known as the "Glassy Nautilus" but is 

 not related to the genuine Nautilus. Length 

 of shell about 2 inches but variable. 



PI. 35, Fig. 1 



New Jersey to West Indies; West 



Indies 



Family Atlantidae 



GENUS ATLANTA Le Sueur 1817 



Shell fragile, transparent, whorls 

 separated with distinct carina or keel; 

 aperture oval; operculum subtriangular; 

 Pelagic. 



ATLANTA PERONII Le Sueur. Early whorls 

 elevated into a low spire on upper side, 

 later whorls openly coiled but connected by 

 keel; surface with fine growth lines, 

 glassy. Diameter 12 mm. 



PI. 33, Fig. 22 



PI. 66, Figs. 4, 4a 



PI. 74, Figs. 110, 110a 



Cape Hatteras, North Carolina to 

 West Indies; tropics 



ATLANTA GAUDICHAUDI Eudotix and Souleyet 

 PI. 74, Fig. Ill 



Family Naticidae 



The animal is conspicuous on ac- 

 count of its voluminous foot which cannot 

 always be entirely withdrawn into the shelL 

 The latter is partially or entirely covered 

 by the animal when active. 



Shell more or less globular in 

 shape; aperture semilunar, sometimes very 

 large. 



GENUS NATICA Scopoli 1777 



Operculum calcareous (shelly); open 

 umbilicus spirally ribbed. 



NATICA CANRENA Llnne. Shell brown, orna- 

 mented with longitudinal zigzag brown 

 streaks becoming darker upon the bands; um- 

 bilicus filled and covered with a white 

 callus; length 1 inch. 



PI. 35, Fig. 7 



North Carolina to West Indies; Gulf 



of Mexico 



NATICA LIVIDA Pfeiffer (N. Jamalcensis 

 C. B. Adams). Shell small, whorls five and 

 five tenths, nucleus always minute and gen- 

 erally dark brown; heavy brown callus ex- 

 tending partially over umbilical area and 

 upon wall above; usually one wide dark col- 

 or zone, whitish below suture and at base, 

 band apparent inside. Length of a Jupiter, 

 Florida, specimen 13 mm. 



Generally more elevated than N. 

 maroccana, coloring like N. triserlata. 



PI. 35, Fig. 6 



North Carolina to West Indies 



NATICA MAROCCANA Dlllwyn. Similar to N. 

 livida but chiefly distinguished by the 

 operciilum with a double marginal rib, the 

 outer half of which Is higher than the in- 

 ner. The nucleus of the operculum is over- 

 laid by a thin irregular callus often of a 

 dark color. Length 55 mm. 



PI. 35, Fig. 16 



North Carolina to West Indies 



