A. K Verrill — Molhisoa q/ tlie New England Coast. 251 

 Cadulns Jeffreysii? MonteroKato. 



Verrill, these Transactions, vol. v, p. 559, 1882. 



A number of good specimens, referred to this species with doubt, 

 were taken off Cape Hatteras, at station 2115, in 843 fathoms. 

 These are pretty regularly fusiform and taper gradually to both 

 ends, the posterior end being decidedly smaller than the anterior. 

 The inner or ventral side is usually nearly straight, but often some- 

 what concave, while the outer or dorsal side is pretty strongly and 

 nearly regularly curved. The aperture is decidely obliquely trun- 

 cated, but is nearly circular in a direct end-view. These specimens 

 differ, therefore, from C. Jeffreysii, as figured and described by Jef- 

 freys, in being less swollen medially, and more regularly tapered 

 posteriorly, and especially in not being suddenly contracted and 

 curved near the posterior end, as figured by him. It is possible, 

 however, that these differences may be only unimportant variations, 

 and I therefore refer this shell, for the present, to the European 

 species. 



Our specimens are mostly 5'"'" in length, and about I""" broad, in 

 the middle. 



Cadulus propinquiis? G. o. Sars. 



Verrill, these Transactions, vol. v, p. 558, pi. 58, figs. 31, 32, 1882. 



This species, like the last, is referred to the corresponding Euro- 

 pean form with much doubt. It differs especially in having the oral 

 aperture decidedly obliquely truncated, while in the European R. 

 propinquus it is described as not at all oblique, and this character is 

 made an important one by Mr. Jeffreys. Our specimens are consid- 

 erably smaller, more swollen dorsally, and relatively stouter than 

 those we have referred to Jeffreysii. 



The shell is short-fusiform, considerably swollen in the middle, 

 and nearly evenly curved on the dorsal side, while the ventral side is 

 usually nearly straight, but sometimes slightly concave, and usually 

 slightly convex in the middle. The anterior end is gradually 

 tapered from the middle to the aperture, which is rather large, 

 decidedly oblique, nearly round in a front view, though often 

 slightly compressed laterally. Behind the middle the shell tapers 

 more rapidly to the posterior aperture, which is about two-thirds the 

 diameter of the oral. Usually the posterior opening is simple, or 

 nearly so, and transversely truncated, but in some specimens there 

 is a shallow lateral notch on each side. The surface is polished and 

 lustrous. 



