A. JS. Verrill — 3£ollusca of the JVeio England Coast. 445 



short-tviaugular, subacute, with a sliallow concave notch. The liga- 

 ment-pit is small and triangular. The hinge-margin is thin and 

 simple. Beaks small, rising slightly above the margin in the left 

 valve, and not quite reaching the margin in the right valve. The 

 anterior margin of the shell projects considerably forward in a broad 

 curve; the ventral margin is broadly and regularly arched, but pro- 

 jects downward a little more strongly behind the middle ; the poste- 

 rior margin is much less convex than the anterior, and in its upper 

 part somewhat straightened. The concentric undulations of the sui-- 

 face are broad and regular, the depressions about equal to the undu- 

 lations ; they become much broader in proportion as they recede 

 from the umbos, the last four occupying about one-half the breadth of 

 the shell. The radiating lines are very thin, but distinctly elevated 

 and roughened, or rendered slightly irregular by the very fine micro- 

 scopic lines of growth, which everywhere cover the shell. The radiat- 

 ing lines are readily visible without a lens. Color translucent bluish 

 white. 



Length, lO'"^'"; height, 20™°'; breadth, 5'"'". 



The single living specimen was taken at station 2229, in 1,423 

 fathoms, N. lat. 37° 38' 40", W. long. V3° 16' 30", (No. 44,827); a 

 fragment occurred at station 2221, in 1,525 fathoms (No. 44,828.) 



BRACHIOPODA. 

 Atretia gnomon Jeffreys. 



Ann. Mag. Nat. Hist., Sept., 1876, p. 251; Proc. Zool. Soc. Loudon, for 1878, p. 



412, pi. 23, fig. 4. 

 Verrill, Trans., Conn. Aoarl., vol. vi, p. 234, 1884. 



This species was included in my preceding catalogue as one of 

 those which had been taken off the coast of Labrador (Valorous 

 Exp.), but not from off the coast of the United States. In 1884, 

 however, it was taken in large numbers at station 2221, N. lat. 39° 

 05' 30", W. long. 70° 44' 30", in 1,525 fathoms (two hundred and 

 twenty-five specimens, mostly living.) A few specimens also occurred 

 at the adjacent station, 2222, in 1,537 fathoms; and a single living 

 specimen was taken at station 2174, N. lat. 38° 15', W. long. 72° 03', 

 in 1^594 fathoms. 



These specimens agree perfectly with north European specimens 

 sent by Dr. Eriele. 



