476 
A. K. Ve-erilb — daiatoyne of A/arine Mollusca. 
second whorl a third, anterior carina appears, and these, before the 
third turn, begin to be crossed by thin, raised riblets; the succeed- 
ing upper whorls are more or less carinated al 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- 
tinct, posterior sinus. 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 mm ; breadth, 
7'75 m,n ; length of body-whorl, in front, I2 mm ; its breadth, 6 mm ; 
length of aperture, 9 mm ; its breadth, 3 ram . Another elongated speci- 
men is 17 ram long; breadth, 6'5 inra ; length of aperture, 7 , 5 mm ; its 
breadth, 2 , 5 mm . One of the shorter form is 15'5 ram long; breadth, 
7 mm ; length of aperture, 8 m " ; its breadth, 3 n,m . The specimen of 
which the uncini are figured was a female, from Eastport, Me., and 
measured 14 min in length; breadth, 6 nim ; length of body-whorl, with 
canal, 9*5 ,nm ; its breadth, 5 mm ; length of apei*ture, 7 mm . 
The uncini (Plate LVII, tig. 13), are relatively large, long, slender 
(but less so than in B. exaratd), very acute, not distinctly barbed ; 
basal process longer than broad, narrowed and bluntly rounded pos- 
teriorly. Length of uncini, •0507 ram ; breadth of shaft, •0066 mm ; 
length of base, '0107" ,m ; its breadth, *0086 ram . 
This shell extends from Martha’s Vineyard, in 126 and 312 
fathoms (stations 877, 047 ), 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 Men an I., 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, etc., 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. Vdhlii , 
B. can cello to , and B. pyramidalis. 
This species is liable to be confounded, especially when eroded, 
with B. harpularia , B. plea rot o maria and B. Grouldii. From the 
