EAST COAST MARINE SHELLS 



75 



ACMAEA TESTUDINALIS AMAENA Say. Shell oval, 

 apex almost in middle; color yellowish gray 

 with dark brownish stripes and a somewhat 

 broken pattern; interior white with a large 

 dark central area; border tessellated with 

 white arid brown. Length 35 mm. 



It is plentiful upon rocks exposed 

 to surf, particularly upon the coast of 

 Maine. The largest and finest examples in 

 that state are taken at Eastport. South of 

 Boston it is much smaller and less plenti- 

 ful. American specimens are usually much 

 larger than the typical European A. testud- 

 inalis of Muller. 



PI. 30, Fig. 8 



North Atlantic and Arctic Oceans, 



southward to Long Island Sound, 



New York 



ACMAEA TESTUDINALIS ALVEUS Conrad. A very 

 small, thin, shell with a sharp and slight- 

 ly hooked apex; striped with brown, interi- 

 or showing exterior pattern. Length 8 mm. 



This subspecies lives upon seaweed 

 or the fronds of Zostera, exactly matching 

 the background. 



PI, 29, Fig. 17 



PI. 79° Fig. 7,g- 



Arctic Ocean southward to Cape Cod, 



Massachusetts 



Family Fissurellidae 



Shell limpet-shaped, with perfora- 

 tion or anterior slit, sometimes a notch, 

 for passage of excretions; horseshoe- 

 shaped impression of adductor muscle in- 

 side shell; bilaterally symmetrical. 



GENUS FISSURELLA Brugulere 1791 

 (LITTLE CHINK) 



Mantle edge of animal crenulated 

 above and below. The development of the 

 shell is shown in Fig. 39. 



Fig. 39 

 Development of shell in Fissurella 



FISSURELLA BARBADENSIS Gmelin. Barbados 

 Chink. Shell conical, orifice almost round 

 or oval; about eleven of the ribs most 

 prominent; color gray, green or pink with ■ 

 purplish brown blotches between the ribs. 

 Interior with alternating green and white 

 rings, interior orifice callus green and 

 usually bounded by brown; edge of shell 

 crenulated. Length 35 mm. 



An extremely common species in the 

 West Indies and an excessively variable 

 one. 



PI. 30, Fig. 2 



Charlotte Harbor, Florida to West 



Indies 



FISSURELLA FASCICULARIS Lamarck. Bundle 

 Chink. Orifice cross-shaped; margin wav- 

 ing; shell elevated in front and rear; sad- 

 dle-shaped like F. pustula but the forty- 

 seven radiating riblets coarser; color usu- 

 ally red, whitish between ribs; interior 

 white, tinged with pink; opening upon in- 

 side sometimes tinged with red; edge crenu- 

 lated. Length 20 mm. 



PI. 30, Fig. 1 



Florida Keys and West Indies 



FISSURELLA NODOSA Born. Knotty Chink. 

 Shell elevated, base oval, about twenty- 

 three strong ribs with nodes upon them; or- 

 ifice oblong, contracted in center and con- 

 sequently dumb-bell shaped, opening one 

 seventh to one ninth length of shell. The 

 color ranges from brown to white, interior 

 white, edge toothed. Length 29-35 mm. 



PI. 30, Fig, 12 



Florida Keys and West Indies 



FISSURELLA PUSTULA Lamarck. Blistered 

 Chink. Shell depressed, elevated in front 

 and behind; orifice cross-shaped, toward 

 the front, bounded by red; color buff, 

 white, or crimson with white; riblets sepa- 

 rated by narrow grooves; interior white 

 with red near opening; edge crenulated. 

 Length 1 inch. 



A well-known and interesting shell, 



PI, 30, Fig, 4 



Cape Hatteras, North Carolina to 



West Indies 



GENUS LUCAPINA Gray 1857 



Orifice rather large, oval; surface 

 cancellated; edge of shell uniform and not 

 raised at ends; margin finely crenulated. 



