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366 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
the shoulder, is more distinct, and crosses the ribs so as to give their 
upper ends a subnodulous appearance; below this there is usually a 
rather wide, smooth zone; no revolving lines above the shoulder. Aper- 
ture about half the length of the shell, rather wide, angular; canal 
short. There is a very distinct, moderately deep, posterior sinus; the 
middle of the outer lip projects forward strongly. Ordinary specimens 
are about 6.5"" long; 3.5"" broad; aperture, .3”" long. 
Our shell is not so stout as that represented in the figure of Leche, 
but it agrees very well in other respects. 
Bela exarata (Moller) H. & A. Ad., Genera, i, p. 92, 1858. 
G. O. Sars, op. cit., p. 232, pl. 16, fig. 13; pl. ix, figs. 1 a, b (dentition, &c.).— 
Verrill, Trans. Conn. Acad., v, pl. 43, fig. 15. 
A regularly cancellated species of Bela, agreeing with Greenland 
specimens sent under this name from the University Museum of Copen- 
hagen, is not uncommon, ranging from off Massachusetts Bay to the 
Bay of Fundy and Nova Scotia. It does not agree perfectly, however, 
with G. O. Sars’s figure of the shell, but its dentition agrees well with 
his figure and seems to be characteristic. The color of the shell is 
usually pale greenish or greenish white; texture thin; size medium; 
whorls turreted, flattened, angularly shouldered close to the suture, with 
the angle of the shoulder rather sharply nodose. Ribs numerous, regu- 
lar, nearly straight, narrow but rounded, separated by concave inter- 
rals of equal or greater width. Whole surface covered with -regular 
and rather strong, elevated, revolving cinguli, which cross the ribs and 
produce on them small, rounded nodes, and give a very regularly and 
strongly cancellated appearance to the whole surface. On the penulti- 
mate whorl there are about four cinguli below the angle. The flattened 
space above the shoulder is crossed by the ribs and covered with 
numerous fine revolving lines. Length, 10"; breadth, 4.5"; length of 
aperture, 5.5"", A more elongated form, similar to the above, but with 
the angle of the whorls still more sharply nodose, also frequently occurs. 
This I have supposed to be the male of the same species, but it agrees 
closely with Sars’s figure of Bela mitrula (Lovén). The dentition of 
B. exarata closely resembles that of the latter, as figured by Sars. The 
teeth are unusually long and large for the size of the shell, rather slen- 
der, somewhat curved, acute, with one side excavated to near the tip; 
basal part short, a little thickened, notched deeply on one side, obtuse. 
Living specimens were also dredged this year at stations 880, 892, and 
894, in 252 to 487 fathoms. 
Bela rugulata (Miller) H. & A. Ad., Genera, i, p. 92, 1858. 
G. O. Sars, op. cit., p. 230, pl. 23, fig. 6; pl. viii, figs. 13 a-c (dentition). 
This is one of the several species that have commonly been confounded 
under the name of * Bela turricula”. 
Our shell agrees well with the figures and description given by G. O. 
Sars, both as to its external characters and dentition. The sculpture 
