564 A. E. Yerrill — Catalogue of Marine Molhtsca. 
in the shorter rostrum, with its dorsal outline concave, and the end 
more or less turned up, and often a little bent or twisted laterally ; 
and in the posterior lateral tooth of the right valve, which is short- 
triangular, rising up into a distinct point, and usually distant from 
the cartilage-pit, which is small, and usually projects sharply in- 
ward from the margin, forming a distinct angle on each side. The 
nucleus is minute, round, glossy, not so closely appressed to the edge 
as in the preceding species. The shell is white, nearly smooth, 
translucent. The largest specimens are about 15 mm long. 
Oft’ Martha's Vineyard, stations 869, 891 to 895, in 192 to 500 
fathoms, 1880; stations 938, 947, 994, 997, 998, 1028, in 302 to 410 
fathoms. 1881. Oft' Chesapeake Bay, station 898, in 300 fathoms. 
Bay of Fundy, 1872 ; Gulf of Maine, stations 1b, 3b, 5b, 45b, 74b, 
75b, in 52 to 92 fathoms, 1873, 1874; oft’ Cape Cod, station 362, in 
106 fathoms, 1879. 
Some of our specimens approach Xeoera subtorta G. O. Sars, in the 
form of the shell, curve of the rostrum, and structure of the hinge, 
but I am unable to separate these, by any constant characters, from 
the ordinary forms. Perhaps the true X. subtorta , of Europe, may 
be only a variety of this species. X. pellueida Stimpson is a young 
shell, of the X. obesa pattern. I have dredged the same form, as 
well as larger examples, in the same localities where his were ob- 
tained. 
Poromya granulata Nyst) Forbes and Hanley. 
Poromya granulata G. 0. Sars. op. cit., p. 90, figs. 6 a, b. 
VerrilL Trans. Conn. Acad., t. pi. 44, figs. 3, 4; Proc. U. S. Nat. Mus., iii, p. 396, 
1880. 
DalL, BuIL Mus. Comp. ZooL. ix. p. 108, 1881. 
Embla Korenii Loven. Ind. MolL Scand. Oceid., p. 46, cuts, 1846. 
Plate XLIY. figures 3, 4. 
Several adult, living examples of this shell were dredged in 1872 
by Dr. A. S. Packard and Mr. C. Cooke, on the Coast Survey 
steamer “ Bache,” in the Gulf of Maine, in 150 fathoms, mud. In 
1880, it was taken at stations 865-867, in 65 fathoms, and 874 in 
115 fathoms. In 1881, it occurred at stations 940, 949, 1035, 1036, 
1038, 1040, in 93 to 146 fathoms. 
Gulf of Mexico and W. Indies, 15 to 229 fathoms, Blake Exp. 
(t. Dali.) On the European coast, from Lofoten I. to Madeira and 
the Adriatic Sea. 
Fossil in the Pliocene of England, southern France, Calabria, and 
Sicily (t. Jeffreys). 
