502 A. E. Verrill— Catalogue of Marine Mollusca. 
incurved. Canal moderately long, somewhat contracted, spirally 
curved to the left and strongly bent backward at the tip. Columella 
very much bent, with a strong sigmoid curvature; the portion oppo- 
site the middle of the aperture greatly receding. Epidermis thin, but 
firm, yellowish green to olive-green, when fresh and uninjured covered 
with fine, short capillary processes, forming spiral lines along the 
eingull, 
The nucleus is moderately large (diameter 2°15"), somewhat mam. 
millary; its first whorl is strongly turned up obliquely and incurved, 
smooth. The median tooth of the radula is broad, with three denti- 
cles, the middle one largest; the lateral teeth are large, with three 
sharp, curved denticles, the outer one much the largest, the middle 
one smallest; occasionally the inner one bears a small secondary 
denticle on its outer edge. 
Operculum long, ear-shaped, with the nucleus at the tip of 
the small end, which is but little ineurved; inner edge strongly 
convex, beyond the middle; outer edge broadly rounded; color, dark 
yellowish green. The verge is moderately large, sigmoid, flattened, 
tapering to an obtuse point, with a small conical papilla near the tip, 
on the dorsal side. 
Color of the shell white; inside of aperture translucent bluish 
white. 
A female of the ordinary adult size and form is 65"™ long ; breadth 
28™™; length of canal and body-whorl, 46™™; breadth of body- 
whorl, 25""; length of aperture, 35"™; its breadth, 14™™; breadth 
of opening of canal, at base, 5™™. 
An average male is 56™™ long; breadth, 26™"; length of body- 
whorl, 40" ; its breadth, 17°"; length of aperture, 31™™ ; its breadth, 
12™", A specimen more slender than usual, is 55™" long; breadth, 
22™™; length of aperture, 30™" ; its breadth, 10™". 
On the American coast, this species was first dredged by us in 
1877, on the United States Fish Com. steamer “ Speedwell,” off Cape 
Sable, N. 8.,in 88 to 91 fathoms, fine compact sand, where it occurred 
in considerable numbers, living; and off Halifax, 42 fathoms, dead. 
Off Martha’s Vineyard this species is very common, in deep water ; 
it occurred, at 48 stations in that region, in 1880 and 1881. Living 
specimens were taken, in 86 to 410 fathoms, but it is most abundant 
between 200 and 410 fathoms; at station 998, in 302 fathoms, 154 
specimens were taken, 140 of them living. Dead shells, inhabited by 
Eupaguri, occurred in 64 to 85 fathoms, and also in 458 fathoms, It 
was taken by Lieut. Z. L. Tanner, on the “ Fish Hawk,” in 1880, off 
