254 NEW-YORK FAUNA MOLLUSCA. 



B. elongatus. (Conopea id. Say, Ac. Sc. Vol. 2, p. 324 ) Elongated into compressed processes, 

 acutely edged above and beneath, and usually as long as the body of the shell. Posterior opercular 

 valves larger, more prominent, truncated or widely emarginate at the tip. Color, soiled brown 

 epidermis ; under this, white, clouded and lineated with brown. On Gorgonia virgulata. Southern 

 coast. 



B.punctatus. (Montagu, Test. p. 8, pi. 1, fig. 5. Penn. Br. Zool. Vol. 4, p. 147, pi. 40, fig. 3.) 

 Shell conical-truncate, rugged, with the valves and opercle punctured ; edges of the superior and 

 inferior of the opercular valves indented and locked into each other. Color, dull brown. Height, 

 0.25. Northern coast? 



B. ovularis, Lam. (Goitld, 1. c. fig. 7.) Shell small, variable in shape, more or less furrowed 

 externally; aperture rhomboidal. Opercular valves obsoletely striated ; the anterior ones shortest 

 and acute; the posterior ones deeply notched near the obtuse summit. Color, white. Common. 

 Northern coast. 



FAMILY LEPAD^. 



Animal with its mantle extended beneath into a contractile and fleshy pedicel, by which it is 

 attached to submarine bodies. Shell composed of Jive principal valves. 



GENUS ANATIFA. Lamarck. 



Animal compressed, with a very thin mantle, and supported by a tendinous and tubular pe- 

 duncle. Cirri curved, and issuing from the side towards the summit of the body. Shell 

 subtriangular, compressed, formed of five very distinct valves enveloping completely the 

 animal. 



Anatifa anserifera. 



plate xxxiv. fig. 315. 

 (state collection.) 



Leptu anserifera. LiN. Syst. Nati p. 1109. 



Lepas striata ? Gould, InverteLrata of Mass. p. 20. 



Description. Shell compressed, subtriangular. Valves five, polished ; the angular incre- 

 mental lines are distinct, and crossed by slightly grooved lines. The azygous valve long, 

 curved, carinate and deeply furrowed longitudinally, and curved under the base ; its attenuated 

 upper extremity concealed between the two smaller valves. Peduncle corrugated. 



Color. Shell pearly white ; margins brownish ; peduncle reddish. 



Height, 0-6; width at base, 0*4; length of peduncle. O-S. 



Found on ship's bottoms in the harbor of New-York. 



