﻿384 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



edged, and recedes in a broad curve anteriorly, so tliat the body of the 

 shell is relatively verj small. There is a small, shallow pit in the place 

 of the spire. Sculpture inconspicuous; many lines of growth, and A^erj- 

 tine, wavy, spiral striae, visible with a lens, cover the whole surface, 

 w^hich has a glistening and opalescent or pearly luster. 



Length of the entire animal, 25""'" or more; length of shell, 15"""; 

 breadth of shell, 10™"'. 



Several living specimens from station 870, about 100 miles south of 

 Newport, R. I., in 120 fathoms. 



This is one of the largest species of the genus, and one of the most 

 beautiful and delicate. 



Philine Finniarchica M. Sars. 



G. O. Sills, op. cit., p. 298, pi. 18, fig.s. 10 a-d ; pi. xii, %. 1 a, I (deutitiou). 



Ofl' Cape Sable, Nova Scotia, 90 fathoms, fine sand, 1877 ; 70 to 75 

 miles south of Martha's Vineyard, G5 to 102 fathoms. 



Philine fragilis G. O. Sars. 



G. O. Sars, op. cit., p. 296, pi. 18, figs. 11 a-c ; pi. xii, fig. 2 (dentition). 



Oft' Cape Sable, Nova Scotia, 00 fathoms, line, compact sand, 1877; 

 Jeffrey's Ledge, Gulf of Maine,' 88 to 92 fathoms, 1 874, several large 

 living specimens. 



Philine cingulata G. O. Sars. 



G. O. Sars, op. cit., p. 297, pi. 2(), lig.s. 7 a-c; pi. xii, fig. 3. 



Off Cape Sable, Nova Scotia, 90 fathoms, with the preceding. Taken 

 this season at stations 892 and 894, in 487 and 3G5 fathoms. 



These four species of Philine are new to the American coast. Prob- 

 ably 'additional species of this genus will be detected when all our col- 

 lections shall have been fully examined. 



Pleurobranchcea tarda Venill. 



Amer. Jonin. Sci., xx, p. 398, Nov., 1880. 



Bodj' subovate, stout, thick, often nearly half as broad as long, 

 usually less, tapering backward and blunt posteriorly; front broad, 

 convex or subtruncate ; back more or less convex or swollen in the 

 middle, with the surface wrinkled or irregularly reticulated, with the 

 sunken lines brown, the reticulations smaller posteriorly. Dorsal ten- 

 tacles short, stout, wide apart, ear-like, subtubular, having a slit on the 

 outer side, with the edges often rolled in. Gill rather large, well 

 exposed in a dorsal view, situated on the right side, behind the middle, 

 and equal in length to nearly one-fourth the body, plumose, bipinnate, 

 with 15 or 1(5 pinnre on the upper side. Foot broad, often nearly as wide 

 as the mantle, subtruncate or rounded in front, narrowed and obtuse 

 posteriorly, ordinarily not extending beyond the mantle. The mantle 

 edge is but little prominent, except along the right side. Proboscis 

 l^rotruded in most of the specimens, large, thick, obtusely tapered close 

 to the end, which is emarginate, showing the large odontophorc in a 



