384 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



edged, aud recedes in a broad curve anteriorly, so that the body of the 

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

 of the spire. Sculpture inconspicuous; many lines of growth, and very 

 fine, wavy, spiral strios, visible with a lens, cover the whole surface, 

 which 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 876, 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 Finmarchica M. Sars. 



G. O. Sars, o]}. cit., p. 298, pi. 18, figs. 10 a-d; pi. xii, fig. 1 a,h (deutition). 



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

 miles south of Martha's Vineyard, 05 to 192 fathoms. 



Philine fragilis G. O. Sars. 



G. O. Sars, op. cit., p. 298, -p]. 18, figs. 11 a-c ; -pi. xii, fig. 2 (dentition). 



Off Cape Sable, Nova Scotia, 90 fathoms, fine, compact sand, 1877; 

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

 living specimens. 



Philine cingulata G. O. Sars. 



G. O. Sars, op. cit., j). 297, pi. 28, figs. 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 365 fathoms. 



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

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

 lections shall have been fully examined. 



Pleurobranchasa tarda Verrill. 



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



Body subovate, stout, thick, often nearly half as broad as long, 

 usually less, tapering backward and blunt x>osteriorly ; 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, 

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

 with 15 or 16 pinnte on the upper side. Foot broad, often nearly as i^ide 

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

 posteriorly, ordinarily not extending beyond the mantle. The mantle 

 edge is but little i)rominent, except along the right side. Proboscis 

 protruded in most of the specimens, large, thick, obtusely tapered close 

 to the end, which is emarginate, showing the large odontoi)hore in a 



