432 A. E. Verrill — Mollvsca of the ISTern England Coast. 



concave side are widest apart. Between the ribs the whole sur- 

 face is covered witli regular, fine and close, microscopic longitudinal 

 lines, which also cover the ribs where they are not worn. Distinct 

 and rather close lines of growth cover the surface and in some places 

 make, with the longitudinal stria?, a fine reticidated structure. An- 

 terior aperture nearly lound, but slightly angulated in line with the 

 principal ribs ; edges thin, but the shell is thickened and the interior 

 is circular farther back. The posterior end is rather small, with a 

 very small aperture, the shell being thickened, but the tip is so eroded 

 as to render uncertain the existence of a slight notch. 



Color dull grayish white. 



Length, 45""" ; diameter of large end, 6"""; of small end, 3""". 



Station 2,268, off Chesapeake Bay, in 68 fathoms, one living speci- 

 men (No. 44,671). 



This species is easily distinguished from all others of our coast, by 

 the very large and strong longitudinal ribs, and the fine longitudi- 

 nal strife between them. 



Dentalium ensiculus Jeffreys. 



DentaHum ensiculus JeS.TejB, Ann. Mag. Nat. Hist., Feb. 1877, p. 154; Proc. Zool. 

 Soc. London, 1882, p. 660, pi. 49, fig. 4. 



Station 2,174, oflf Chesapeake Bay, N. lat. 38° 15', VV. long. 72° 03', 

 in 1,594 fathoms, two living specimens (No. 38,635) ; and station 

 2,221, N. lat. 39° 05' 30", W. long. 70° 44' 30", in 1,525 fathoms, two 

 specimens, one living (No. 38,636). 



This species is easily recognized by its strongly flattened form, 

 with a sharp edge along the convex side. It is rather strongly 

 carved and has a deep posterior notch on the convex side. 



Mr. JetFreys records it from off the European coast, taken by the 

 Porcupine Expedition in 1869 and '70; by the Valorous Expedition, 

 in 1,450 and 1,785 fathoms; and from the Challenger Expedition, in 

 470 fathoms, oft" St. Thomas, W. I. 



Cadulus Spectabilis A^errill, sp. nov. 



Plate XLIV, figure 19. 



Shell very large for the genus, rather strongly curved, especially 

 behind the middle, swollen and somewhat angular and gibbous a 

 short distance back of the aperture. The gibbosity or swelling 

 affects most the dorsal side, but is distinct, also, on the sides and ven- 



