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A. E. Verrill— Mollusca of the New England Coast. 153 
come stouter and more prominent, each bearing a small rounded or 
angular nodule; below the shoulder the ribs are moderately stout, 
usually rounded or obtuse at summit, but sometimes, especially on 
the upper whorls, angular or subacute. They are slightly oblique 
or flexuous and cross the entire breadth of the upper whorls, but 
fade out about the middle of the last whorl. There are about 
twenty of these ribs on the last whorl. Strongly marked cinguli 
cover the whorls below the shoulder, these become coarser and 
more raised on the anterior part of the last whorl and on the canal, 
where they are separated by wider concave interspaces, and rough- 
ened by the distinct lines of growth crossing them; on the middle of 
the convexity of the whorl they are less conspicuous and but slightly 
raised, and not very close together; they are more conspicuous in the 
intervals between the ribs, the summit of the ribs being but slightly 
roughened by their crossing, except close to the shoulder, where they 
often form minute nodules; they are usually wanting on the subsu- 
tural band, but are sometimes faintly marked on that portion. Dis- 
tinct lines of growth, parallel with the lip, cover the surface of the 
shell and are most distinet on the subsutural band, between the ribs. 
The aperture is narrow-ovate, angulated posteriorly. The outer lip is 
thin, projecting forward in the middle in a strong, regular curve, but 
greatly receding toward the shoulder. The sinus is rather deep and 
wide, situated just above the angle of the shoulder and separated from 
the suture by the convex portion of the subsutural band. The colu- 
mella is sinuous; the canal is a little prolonged, rather narrow, 
and straight. 
The four nuclear whorls are yellowish or pale horn-color, and form 
a very acute apex when perfect. The first is very minute and some- 
what upturned and prominent; the second is also minute; the third 
and fourth increase rapidly ; the first three, in our most perfect speci- 
mens, are smooth and somewhat glossy; the fourth is crossed by 
numerous, thin, delicate, raised longitudinal lines, which are a little 
oblique and recurved in the middle, but not crossed by another 
set, as seen in many other species. Color translucent white, some- 
times faintly tinged with gray or pink, surface glossy. No epidermis. 
Operculum wanting. 
One of the largest specimens is 11™™ long; breadth, 4°5™™; length 
of body-whorl and canal, 7°5""; of aperture, 6™™; its breadth, 2", 
Other examples are more slender, with a narrower aperture. 
Stations 2037, 2038, 2041, 2042, 2043, 2084, and 2096, in 1290 to 
2033 fathoms. It occurred in the greatest numbers, living, at station 
