462 A. E. Verrill — Catalogue of J7 urine Mollusca. 
mella strongly excavated in the middle, obliquely receding at the 
end. 
The shell is commonly greenish white and covered by a thin, 
close, greenish epidermis; but some specimens are clear white, and 
rarely pinkish. 
Ordinary specimens are about 6'5 inm long ; 3 , 5 mm broad ; aperture, 
3n.n1 i on g A rather large specimen measures 7"“" long ; 4"’ m broad ; 
aperture, 4""" long; body-whorl, 5 mn ‘ long. One. of the largest, 
having six whorls, is 8 ,n,n long; 4-5 ,,im broad; body-whorl, 8""“ 
long ; aperture, 4 - 5"‘ m long. 
Uncini small, numerous (30 to 40), narrow lanceolate, not very 
slender, acuminate, not barbed, but with strongly involute edges ; 
base large, the terminal lobe obtusely rounded, about as broad as 
long. 
This is one of the most common and generally distributed spe- 
cies of Bela found on the New England coast. It inhabits both 
muddy and sandy bottoms, and sometimes is found among gravel 
and rocks. It occurs from the region oft' Newport, R. I., northward 
to Labrador, and from very shallow water, in the Bay of Fundy and 
Casco Bay, to 500 fathoms, off Martha’s Vineyard. It is very com- 
mon from Massachusetts Bay to the Bay of Fundy and Halifax, 
X. S., in 10 to 50 fathoms. 
It was sent to me, as from Labrador, mixed with “ /A exarata ” (— 
B. concinnula), by Dr. A. S. Packard, Jr. I have dredged it in 
Eastport harbor and the Bay of Fundy, at many localities, in 5 to 
110 fathoms, in 1864-1872. George’s Bank. Casco Bay and Gulf of 
Maine, 1873, many localities, in lo to 40 fathoms, — U. S. Fish Com. 
Salem harbor, 5 fathoms, 1873; Gulf of Maine, at seven stations, 27 
to 92 fathoms, 1874 ; Massachusetts Bay, 20-25 fathoms, 1877 and 
1878; Halifax harbor, 16-21 fathoms, and off Nova Scotia, 42 
fathoms, 1877 ; Massachusetts Bay and Cape Cod Bay, many locali- 
ties, in 13-30 fathoms, and off Cape Cod, 26-67 fathoms, 1879; off 
Newport, R. I., stations 814, 880, 891, in 27, 252, and 500 fathoms; 
off Martha’s Vineyard, station 987, 28 fathoms, 1881, — U. 8. Fish 
Com. Gulf of St. Lawrence, off' Shediac, 10 fathoms, — coll. .1. F. 
Whiteaves. 
This is a small, but well-characterized species, easily distinguished 
from all others of our coast by its short, turreted spire ; angular 
and flattened whorls; short, straight ribs; deep, rounded sinus; 
short canal ; and especially by the peculiar, tine, incised revolving 
lines. It has, probably, hitherto been confounded, most commonly, 
