PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 399 
whole surface of the shell. The shell itself is rather large, swollen, 
subovate, well-rounded ventrally, but obliquely subtruneate anteriorly. 
Rostrum rather short, narrow, well defined, tapered; on the rostrum 
there are eight or nine rather broad, low, radiating cost. The body of 
_the shell is covered with regular, raised and strong, radiating cost, 
over fifty in number, separated by deep grooves of about the same 
width as the cost; anteriorly these ribs become small; posteriorly, 
near the base of the rostrum, five or six become much larger than the 
rest, and have smaller ones alternating with them. 
Color yellowish white ; in life rosy, from the internal organs showing 
through. Length, 19""; beak to ventral edge, 12"". 
South of Martha’s Vineyard, 115 fathoms; about 90 to 100 miles 
south of Newport, 85 to 120 fathoms, stations 871, 873, 874, 876, &e. 
Several living specimens of various sizes. 
Cardium, sp. 
A roundish species of Cardium, about 18"" in diameter, is represented 
by a single valve, in good condition. The surface is rather closely and 
regularly cancellated. The ribs are smooth, without scales or spines. 
It was taken at station 865. 
Astarte crenata Gray. 
Parry’s Voyage, app.—Friele, Catal. Norv. Nordmeer-Exp. Spitzb., MOll., p. 
267, 1879. 
? Astarte crebricostata Forbes; Jeffreys; G. O. Sars; and other European 
writers. 
Astarte crebricostata Gould, Invert., Mass., 2d ed., p. 126, fig. 440 (var. lens). 
Astarte lens (Stimp., MSS.) Verrill, Amer. Journ. Sci., iii, p. 287, 1872. 
Large numbers of specimens, which seem to agree closely with the 
typical arctic and deep-water form of this species, were taken at nearly 
all the stations, in 65 to 500 fathoms. It was most abundant at stations 
880, 894, 895. . 
These form series that appear to graduate into the large, broad, flat- 
tened form to which the name lens has been applied, which is abundant 
in the Bay of Fundy and Gulf of Maine, in 50 to 150 fathoms. 
The typical form is smaller, more swollen, with the edges more 
rounded, and less expanded posteriorly. All the forms have the edges 
regularly crenulated. 
Cryptodon Sarsii (Phil.). 
Axinus Sarsii G. O. Sars, op. cit., p. 60, pl. 19, figs. 5 a, bd. 
A single dead specimen of a shell agreeing very closely with this 
form, as figured by G. O. Sars, was dredged by our party, in 1879, off 
Cape Cod. 
Crypton obesus Verrill. 
Amer. Journ. Sci., iii, p. 287, pl. 7, fig. 2, 1872. 
I may take this occasion to remark that Sars’s figure (pl. 19, fig. 7) of 
C. obesus Verrill does not represent the large form described by me 
under that name, which is remarkable not only for its swollen form, but 
