224 .-1. E. Verrill — 3Iollusca of the New England Coast. 



beak, wliicli 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, 



Station 2097, off Chesapeake Bay, in 1917 fathoms, (Xo. 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 loiujicaUis Scacchi, Not., p. 16, pi. 1, fig. 7, (t. Dall). 



Abra hngicullis G. 0. Sar.s, Moll. Reg. Arct. Norvegiie, p. 74, pi. 6, fig. 3 ; pi. 20, 



fig. 4, 1878. 

 Syndosmya longicallis Hall, Bull. Mus. Comp. Zool., i.x, p. 133. 

 Scrobicularia longicallus Jeffreys, Proc. Zool. Soc. London, for 1884, p. 145. 



Station 2043, N. lat. 39» 49', W. long. 08° 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 lioica (Dall) is shorter, rounder, and more swollen. 



