200 A, FE. Verrill—Mollusca of the New England Coast. 
Whorls about three and one-half, very convex and evenly rounded, 
separated by a deeply impressed suture. The nuclear whorl is very 
minute and regularly spirally coiled, slightly prominent. The last 
whorl constitutes the greater part of the shell and is shallow and 
very evenly rounded. The aperture is oblique and very nearly cir- 
cular, with only a slight angle posteriorly. The outer lip is a little 
flaring and projects forward anteriorly. The columella-lip is as 
regularly curved as the outer margin; the inner lip is in contact 
with the body-whorl only for a short distance, and shows a distinct, 
continuous, thin edge. The umbilicus is very small, but deep, being 
scarcely more than a pore or perforation, and is partially overarched 
by the edge of the columella-lip. The umbilical area is covered by 
exceedingly fine, close, impressed lines, of which about twenty to 
twenty-five may be counted; the outermost being about midway 
between the center and margin of the base; elsewhere the surface is 
very smooth and polished, with only faint and indistinct lines of 
growth, except that in one case a very few fine, microscopic spiral 
lines were noticed just below the suture. 
The operculum is thin, yellowish horn-color, circular, composed of 
many very narrow turns. 
Length, 2°5""; breadth, 3°"; breadth of aperture, 1°3™™. 
Station 2004, N. lat..387° 19’ 45”, W. long. 74° 26’, in 98 fathoms, 
1883. 
This species resembles the preceding in form, the small size of the 
umbilicus, and in having spiral lines around the umbilicus, with the 
surface elsewhere smooth. It differs, however, in being a thinner, 
more polished, translucent shell; in having the last whorl projecting 
more obliquely forward, and especially in the much smaller and 
more regularly coiled nuclear whorl. 
From station 2038, N. lat. 38° 30’ 30”, W. long. 69° 08’ 25”, in 
2033 fathoms (No. 35,165), there is a specimen of a similar shell of 
larger size, which is, perhaps, a distinct species. It has, like the 
species above described, a minute, regularly coiled nucleus and 
smooth rounded whorls, separated by an impressed suture, and with a 
very narrow umbilical perforation, but the spiral lines surrounding it 
are less numerous, less distinct, and farther apart. The aperture is 
large and nearly circular, but more distinctly angulated posteriorly. 
Length, 3°25""; breadth somewhat greater. 
