224 A. E. Verrill— Mollusca of the New England Coast. 
beak, which is scarcely differentiated from the ventral line of the 
shell. The beak is very short and broad, rapidly narrowing to the 
blunt tip, which is a little bent to one side; the dorsal line, behind 
the beaks, is nearly straight, sloping pretty regularly to the beak. 
The umbos are large, prominent, swollen, strongly incurved and 
turned somewhat backward. The cartilage-pit is of moderate size, 
ovate, and directed obliquely backward, its posterior border adhe- 
rent to the posterior hinge-border, while its inner and anterior edges 
are more or less free. Lateral tooth apparently but little developed, 
but the left valve has the anterior hinge-line broken. There is a 
notch in the edge of the shell opposite the cartilage-pit, in each 
valve. The sculpture consists only of irregular, concentric, raised 
lines or ridges, most of which are not continuous; these become 
strong or more irregular on the beak; they are often crossed very 
obliquely by the finer, raised lines of growth. 
Length, about 38"; height, about 26™"; transverse breadth, 
Grins 
Station 2097, off Chesapeake Bay, in 1917 fathoms, (No. 35,255). 
The only specimen obtained consists of both valves, but neither is 
entire, so that the measurements cannot be accurately made. In 
these the shell is remarkably thickened by a calcareous deposit on 
the inside of the shell, so that all the muscular scars appear as 
sunken pits; this great thickening of the shell, however, may be 
abnormal. This shell appears to be larger and more massive than 
any known species. It is remarkable for its short, swollen form, and 
short, broad beak. It has no radial sculpture. 
Abra longicallis (Scacchi). 
Tellina longicallis Scacchi, Not., p. 16, pl. 1, fig. 7, (t. Dall). 
Abra longicallis G. O. Sars, Moll. Reg. Arct. Norvegive, p. 74, pl. 6, fig. 3; pl. 20, 
fig. 4, 1878. 
Syndosmya longicallis Dall, Bull. Mus. Comp. Zool., ix, p. 133. 
Scrobicularia longicallus Jeffreys, Proc. Zool. Soc. London, for 1884, p. 145. 
Station 2043, N. lat. 39° 49’, W. long. 68° 29’ 30’, in 1467 fath- 
oms, one valve. 
The specimen referred to, I have compared with those taken by 
the “Blake” in the Gulf of Mexico, in 860 fathoms, and identified 
by Mr. Dall as this species. They do not differ in any respect. The 
shell of Abra liotea (Dall) is shorter, rounder, and more swollen. 
