176 A. FE. Verrill— Catalogue of Marine Mollusea. 
second whorl a third, anterior carina appears, and these, before the 
third turn, begin to be crossed by thin, raised riblets; the sueceed- 
ing upper whorls are more or less carinated at the prominent, angu- 
lar, but obtuse shoulder, and have 12 to 14 prominent ribs. 
Aperture, in the adult shell, relatively short and small, oblong- 
elliptical, outer lip broadly rounded, with a broad and shallow, but dis- 
tinet, posterior sus. Canal very short, straight, rather wide and open, 
usually not at all constricted at its base. Columella sigmoid. In 
immature shells the aperture is relatively longer and larger, and the 
canal is longer and narrower. 
Color of the shell often white; sometimes pale rosy, or light 
chestnut-brown, with the canal and anterior part of the body-whorl 
white, as in B. harpularia. 
Length of a large example, of the elongated form, 20"; breadth, 
7°75™"; length of body-whorl, in front, 12™™; its breadth, 6™"; 
length of aperture, 9°"; its breadth, 3"". Another elongated speci- 
men is 17™" long; breadth, 65"™™"; length of aperture, 7°5™™ ; its 
breadth, 2°5™™. One of the shorter form is 15°5"™ long; breadth, 
7™™: length of aperture, 8"; its breadth, 3™". The specimen of 
which the uncini are figured was a rete from Eastport, Me., and 
measured 14" in length; breadth, 6™"; length of body-whorl, with 
canal, 95"; its breadth, 5™™; length of aperture, 7™™. 
The uncini (Plate LVII, fig. 13), are relatively large, long, slender 
(but less so than in J. exarata), very acute, not distinctly barbed ; 
basal process longer than broad, narrowed and bluntly rounded pos- 
teriorly. Length of uncim, °0507'"™; breadth of shaft, -0066™" ; 
length of base, -0107""; its breadth, -0086™. 
This shell extends from Martha’s Vineyard, in 126 and 312 
Nedri 
fathoms (stations 877, 947), north to Nova Scotia and Labrador; and 
probably to Greenland and Northern Europe. It is one of the most 
common species in the cold waters of the Bay of Fundy, near East- 
port, Me., and Grand Menan L, in 10 to 100 fathoms, where I have 
often dredged it, in 1861, 1863, 1864, 1865, 1868, 1870, 1872. We 
have also taken it, on the various U.S. Fish Com. expeditions, off 
Nova Scotia; in the Gulf of Maine; Casco Bay; Massachusetts Bay; 
off Cape Cod, ete., in 12 to 92 fathoms. George’s Bank, 50 fathoms, 
by Smith and Harger, on the “ Bache,” in 1872. Square Island, 
Labrador, 30 fathoms, sent by Dr. A. S Packard, Jr. as B. Vahlii, 
B. cancellata, and B. pyramidalis. 
This species is liable to be confounded, especially when eroded, 
with B. harpularia, B. pleurotomaria and B. Gouldii. From the 
