170 A. E. Verrill— Mollusca of the New England Coast. 
Sipho profundicola Verrill and Smith, sp. nov. 
PLATE XXXI, FIGURE 13. 
Shell thin, stout-fusiform, with very convex, evenly rounded 
whorls and a moderately elevated, somewhat acute, turreted spire, 
which occupies nearly one-half the length of the shell. Whorls six 
or seven, the apex eroded in all of our specimens, apparently with a 
small regularly spiral nucleus. The whorls increase rather rapidly 
and are separated by a deeply impressed suture. The sculpture on 
the two lower whorls consists of strongly marked, narrow, promi- 
nent spiral cinguli, which are somewhat unequal in size, and 
separated by wider, concave interspaces, which are crossed by dis- 
tinctly raised, but delicate and close, lines of growth, due largely to 
the epidermis rising in scale-like forms. These lines of growth are 
less conspicuous over the spiral ribs, which they render somewhat 
uneven. The upper whorls have, in addition to the small spiral 
cinguli, a pretty distinctly marked’ carination at the shoulder, and 
are crossed by slightly elevated, longitudinal ribs or folds, which 
produce a series of slightly raised nodules where they cross the 
larger carina at the shoulder. On the penultimate whorl there are 
from fourteen to sixteen revolving cinguli. Aperture long-ovate, 
broadly rounded in the middle. The outer lip is thin and evenly 
rounded from the suture to the base of the canal, where it forms a 
sinuous curve. The canal is short, narrow, somewhat constricted at 
the base and nearly straight, except near the end, where it is slightly 
recurved. Columella not much bent, its inner edge with a slight 
sigmoid curvature. The operculum is thin, ovate, with the inner 
margin more convex than the outer, and with the posterior margin 
evenly rounded and the anterior end slightly curved to the obtuse 
tip, which shows no spiral structure. The operculum is rather 
small as compared with the size of the aperture. Epidermis is thin 
but distinct, not hairy, though rising’ into scale-like edges along the 
lines of growth. Its color is pale brownish yellow. | 
The only specimen with the animal is a male (from station 2038), 
the largest in the collection. The tentacles are long, slender, taper- 
ing to acute tips. No eyes can be detected in the preserved 
specimen. The other specimens show some variation in the propor- 
tion of length to breadth and in the size and closeness of the revolv- 
ing cinguli, which are sometimes pretty regularly alternately larger 
and smaller. 
Length of the largest specimen, male, 40™™; breadth, 23"; length 
