480 A, E. Verrili— Catalogue of Marine Mollusca. 
at about the middle of the last whorl. Fine, wavy, spiral cinguli 
cover the whole surface, crossing the ribs as well as their interspaces ; 
on the subsutural band they are finer and often nearly obsolete; on 
the shoulder and more convex part of the whorls they are fine and 
close, separated by fine, deep grooves of about the same width; more 
anteriorly, and especially on the last whorl, they become a little 
coarser and more distant, with wider interspaces, in which a finer 
cingulum is often interpolated. The cinguli are roughened by fine 
lines of growth. 
Aperture ovate-elliptical, its inner side expanded in the middle. 
Outer lip with a well-marked sinus close to the suture; below this, 
evenly convex, scarcely incurved at the canal, which is very short, 
straight, and open. Columella nearly straight in the middle. 
Color white or pale pink. 
A specimen of good size and average form is 9°10"" long ; breadth, 
4°5™ ; length of body-whorl, 6-4"; its diameter, 4"™; length of 
aperture, 4°5™"; its breadth, 2"". An unusually large specimen, 
from Eastport, Me., is 12°5"" long; breadth, 6™™. 
This shell is not uncommon on the New England coast, in moder- 
ate depths, mostly in 25 to 75 fathoms. Its range is from off Martha’s 
Vineyard, in 34 fathoms, northward to Labrador. In the Bay of 
Fundy, where it is not rare, [ have taken it in 20 to 100 fathoms, in 
1868, 1870, 1872. It has been dredged by U.S. Fish Com. parties 
in Halifax harbor and off Nova Scotia, 16 to 59 fathoms, 1877; 
Gulf of Maine, in many localities, 27 to 86 tathoms, 1873, 1874, 1877; 
off Cape Ann, 38 to 75 fathoms, 1878 ; Massachusetts Bay, 25 to 26 
fathoms, 1878, 1879; off Cape Cod, 28 to 30 fathoms, 1879; off Mar- 
tha’s Vineyard, station 991, 34 fathoms, 1881. 
According to Dr. P. P. Carpenter, this species was identified from 
the North Pacific (Seniavine Straits and Awatska Bay, 10 to 20 fath- 
oms, N. Pacific Expl. Exp.) by Dr. A. A. Gould. 
Jeffreys formerly identified our shell with B. Trevelyana, but sub- 
sequently (Ann. and Mag. Nat. Hist., April, 1876, p. 329), he changed 
his opinion and considered it the same as B. viridula (Moller) of 
Greenland, and records it from Greenland, 5 to 100 fathoms (Valor- 
ous Exp.), and north of Scotland, 560 fathoms (Porcupine Exp.) I 
am unable to verify the Greenlandic and European localities. 2, 
viridula of G. O, Sars seems to be a distinct species, 
