200 A. K 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 tlie 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, 1-8""". 



Station 2004, N. lat. 37° 19' 45", W. long. 74° 26', in 08 fathoms, 

 1883. 



This species resembles the preceding in form, the small size of the 

 umbilicus, and in having spiial lines around the umbilicus, with the 

 surface elsewhere smooth. It difiers, 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, K 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. Tiic aperture is 

 large and nearly circular, but more distinctly angulated posteriorly. 



Length, 3-25"""; breadth somewhat greater. 



