﻿366 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



tlie 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. Ajier- 

 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 0.5""" 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 (Mulloi) H. & A. Ad., Geneva, i, p. 92, 1858. 



G. O. S.irs, op. cit., ]). 232, pi. 16, tig. 18; pi. ix, tigs. 1 a,h (dentition, &c.). — 

 Verrill, Trims. Conn. Acad., v, pi. 43, fig. 15. 



A regularly cancellated species of BeJa, 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- 

 vals 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 ajipearance to the whole surface. On the jjenulti- 

 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 sharplj" 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 (Loven). 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 (MoUer) H. & A. Ad., Genera, i, p. 92, 1858. 



G. O. Sars, op. cit., p. 230, j)l. 23, fig. 6; pi. viii, figs. 13 a-c (dentition). 



This is one of the several species that have commonly been confounded 

 under the name of '■^ Bela tiirricula^\ 



Our shell agrees well with the figures and description given by G. O. 

 Sars, both as to its external characters and dentition. The sculpture 



