76 



EAST COAST MARINE SHELLS 



Shell Imbedded in mantle of animal. 



LUCAPINA ADSPERSA Philippi. Shell oblong, 

 riblets of various size crossed by raised 

 threads; orifice oval with seven to nine 

 broad rays of varying color and often brok- 

 en into dots and spots; interior bluish 

 white, outside pattern showing through the 

 thin shell; exterior of orifice callus 

 often with a greenish streak on each side; 

 edge crenulated. Length 21 mm. 



Taker by the writer under stones 

 in Upper Biscayne Bay and beneath sponges 

 off Ligniinvitae Key, Florida. The animal 

 Is very bulky and the shell high above and 

 far from the foot. 



PI. 50, Fig. 10 



Florida Keys and West Indies 



LUCAPINA CANCELLATA Sowerby. Shell oblong, 

 often stained with bluish black around ori- 

 fice and interior of hole callus; color 

 greenish or grayish; orifice oval, about 

 one eighth length of shell. Length 23 mm. 



A single beach specimen, quite 

 fresh, was taken at Boynton, Florida. 



PI. 29, Fig. 15 



Florida Keys and West Indies 



GENUS LUCAPINELLA Pilsbry 1890 



Shell oblong, perforation large; 

 animal with fleshy foot much too large for 

 shell but the latter not imbedded in man- 

 tle. 



LUCAPINELLA LIMATULA Reeve'. Orifice ob- 

 long, corresponding to shape of shell; 

 large and small alternating riblets; interi- 

 or white, edges thickened at sides and 

 crenulated front and rear. Length 13 mm. 

 Depth range 0-20 fathoms. 

 PI. SO, Fig. 3 



Cape Fear, North Carolina; Key 

 West, Florida; West Indies 



GENUS DIADORA Gray 1821; 

 Flssuridea Swainson 1840 



Internal callus of orifice truncat- 

 ed or pitted behind; animal capable of be- 

 ing contained In the shell. Often confused 

 with Fissurella. 



DIADORA ALTERNATA Say. Elevated conical 

 surface latticed by ribs, every fourth rib 

 a little larger; shell gray or yellow. 



striped with black or brown (eight stripes); 



s\ammit curved forward; opening keyhole 



shaped; interior white; margin crenulated; 



pit deep. Length 25 mm. 



This shell is sometimes washed upon 



the beach at Cape May, New Jersey. 

 PI. 30, Fig. 5 



ChesapeakeBay to West Indies; Mexi- 

 co 



DIADORA LISTERI Orbigny. Shell elevated, 

 solid, summit slightly in front of middle; 

 slope straight in front, rear slope convex; 

 sculptured with strong ribs crossed by 

 cords and cutting the interspaces into 

 quarish pits. 



The color is grayish white or buff, 

 sometimes with black stripes; ribs alternat- 

 ing in size, both large and small; opening 

 keyhole shape; interior white; border 

 crenulated and with the teeth arranged in 

 pairs. Length 40 mm. 



It lives under stones in Upper Bis- 

 cayne Bay near Arch Creek and the Sunny 

 Isles bridge. 



PI. 30, Fig. 16 



Florida Keys and West Indies 



DIADORA MINUTA Lamarck. Shell small, ob- 

 long, depressed, summit position one third 

 length of shell; fine riblets crossed by 

 sculpture forming beads; shell thin, yel- 

 low or white; seven to eight broad black 

 rays visible also from inside; border 

 crenulated; sides arched so shell rests 

 upon ends only when placed upon a plane 

 surface. Length 10 mm. Fresh beach shells 

 have been taken in Palm Beach County. 



PI. 30, Fig. 13 



Florida Keys and West Indies 



GENUS EMARGINULA Lamarck 1801 



Shell obliquely conical, apex re- 

 curved backward; deep incision in margin. 



EMARGINULA CANCELLATA Philippi. Apex half- 

 way between center and posterior end; sixty- 

 two to sixty-eight close ribs; interior 

 white; slit one fourth length of shell; 

 color white or yellow. Length 12 mm. Depth 

 range 100-287 fathoms, 



PI. 30, Fig. 11 



Off North Carolina; Florida Strait; 



West Indies 



