238 A. E. Verrill—Moilusca of the New England Coast. 
tudinal ribs, which run nearly straight across the whorls, and on the 
last whorl extend to the base of the siphon; these are separated by 
deeply concave intervals of about the same width. The whole sur- 
face is covered by strongly marked revolving cinguli, which cross 
both the ribs and their interspaces, and thicken so as to form small, 
rounded nodules where they cross the ribs; these are separated by 
interspaces of about the same width, in the middle of which there is 
a much smaller, thin revolving cingulus, alternating pretty regularly 
with the larger ones around the periphery. On the anterior part of 
the body-whorl, and sometimes at the periphery, there are two or 
three small revolving cinguli in some of the interspaces. On the 
penultimate whorl there are usually five to seven of the primary cin- 
guli, and on the body-whorl and siphon there are about eighteen to 
twenty. The whole surface is also covered, in perfect specimens, 
with fine, slightly elevated, wavy lines of growth, which are most 
conspicuous on the intervals between the ribs; they are usually 
worn off from the more prominent parts of the ribs and nodules. 
The nucleus consists of about two and one half regularly coiled 
whorls; the first two are small, smooth, translucent and somewhat 
lustrous; the last is covered with rather faint revolving lines, crossed 
by the lines of growth, which gradually merge into the longitudinal 
sculpture of the normal whorls, there being no very distinct demarca- 
tion between the nucleus and the next whorl. The apical whorl is 
minute, regularly increasing. Aperture elongated, ovate-fusiform ; 
outer lip thin, sharp, regularly curved; inner margin regularly 
arched. Collumella somewhat elongated, its margin sinuous and 
somewhat excurved at the tip. Canal narrow and somewhat elon- 
gated, a little curved. Color bluish white. Epidermis very thin, 
pale grayish or yellowish white. 
Length of one of the largest specimens, 15™"; breadth, 7™™; 
length of aperture, 8"; its breadth, 3™™. 
This species was taken, off Cape Hatteras, at station 2109, in 142 
fathoms, in considerable abundance (No. 35,735) ; station 2110, in 
516 fathoms (one dead); and station 2111, in 938 fathoms, one living 
(No. 35,764). Possibly the two latter specimens may be due to 
accidental misplacement. 
This species bears considerable general resemblance to the shallow- 
water species (U. cinerea), but it is a much smaller and more slender 
species, with a narrower aperture and longer canal. The sculpture 
is more simple, there being usually but two sets of revolving cinguli, 
the larger and smaller ones alternating pretty regularly. 
