Perkins.] 144 [November 3, 



SOLENID^. 

 Ensatella Swainson, 1840. 



Ensatella ensis Linn., sp. Ensis ensis Conrad, Am. Journ. 

 Conch., Vol. in, App. p. 26. Solen ensis Linn., Syst. Nat., 1114; 

 Lam., An. sans Vert., Vol. VI, p. 55; Gonld, Invert. Mass., p. 29; 

 De Kay, Moll. N. Y., p. 242, pi. xxiii, fig. 313. 



Dead shells not uncommon; rarely found alive. It is smaller, and 

 lives in deeper water than north, not being found above low water. 

 Animal white ; mantle open in front and behind, with a small fissure 

 near the middle, broadly thickened on the margin; gills long and 

 narrow; foot larger than all the rest of the body, fiattened-cylindri- 

 cal, increasing somewhat in size towards the end, which is obliquely 

 truncated, and the sides bevelled from a central line; palpi long and 

 narrow, except at the base, which extends forward in a wing-like 

 projection; siphons very short, united, except at the end, covered 

 with short papilla?, and fringed around the openings with somewhat 

 longer ones ; muscle long and thin. 



MEASUREMENTS. 



Length of shell 126 mill. Breadth 21.4 mill. 



" foot 83 " (contracted). " 13 " at the end. 



gills 47 " " 7.4 " 



" palpi 15.2 " " 13 " at base. 



SOLECURTID^E. 



Siliqua Miihl., 1811. 



Siliqua costata Conrad, Am. Journ. Conch., Vol. in, No. 3, p. 

 24, App. Machcera costata Gould, Invert. Mass., pp. 24, 34; De 

 Kay, Moll. N. Y., p. 244, pi. xxxii, fig. 301. Solen costatus Say, Am. 

 Conch, p. 104, 1822. Solecurtus costatus Say, Am. Conch., p. 168, 

 pi. xviii, 1822. 



Very rare and small. 



TELLINID^. 



Angulus Miihl., 1811. 



Angulus tenera Tryon, Am. Journ. Conch., Vol. in, No. 5, p. 

 96. Tellina tenera Say, Am. Conch., p. 98, 1822; Gould, Invert. 

 Mass., p. 68, fig. 44; De Kay, Moll. N. Y., p. 209, pi. xxvi, fig. 271. 



