432 A. EF. Verrill— Mollusca of the New England Coast. 
concave side are widest apart. Between the ribs the whole sur- 
face is covered with 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 strie, a fine reticulated structure. An- 
terior aperture nearly round, 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 striz between them. 
Dentalium ensiculus Jeffreys. t 
Dentalium ensiculus Jeffreys, Ann. Mag. Nat. Hist., Feb, 1877, p. 154; Proc. Zool. 
Soe. London, 1882, p. 660, pl. 49, fig. 4. 
Station 2,174, off Chesapeake Bay, N. lat. 38° 15’, W. 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 
curved and has a deep posterior notch on the convex side. 
Mr. Jeffreys 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, off St. Thomas, W. I. 
Cadulus spectabilis Verrill, sp. noy. 
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- 
