PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 403 



Sculpture very numerous (70 to 80 or more) radiating ribs, fine later- 

 ally, increasing in strengtli on each side to the middle, where there are 

 two or three ribs considerably larger than the rest, with wider intervals ; 

 the ribs and intervals are crossed by line, close, raised lines of growth. 



Interior with radiating lines corresponding to the external ones. 

 Length, 4"""; height (beak to ventral edge), 7'""; thickness, 4""". Sta- 

 tion 880, 255 fathoms, scarce ; 891 to 894, 365 to 500 fathoms, common. 



Limcva f/ihha { = Lima (jibba Jeffreys, op. cit., p. 428) also differs but 

 little from our specimens. 



Pecten fenestratus Forbes ('?). 



Ecport ou Mollusca, &c., of -lEgeau Sea, p. 14(J, iu Proc. Britisli Assoc, for 1843. 

 Pecten iitequisculjHus Tiberi (teste Jefi'reys). 



A small, but elegantly colored and sculptured, inequivalve Pecten was 

 taken living at station 872. This I refer doubtfully to the above-named, 

 Mediterranean deep-water species. In our two examples the ujijier valve 

 is finely and regularly cancellated, with fine radiating and concentric 

 lines ; the under valve is covered with fine, raised, concentric ribs only. 

 Ears prominent. Color whitish and different shades of red and brown, 

 irregularly mottled. 



Pecten, sp. (near P. opercular is). 



Fragments of a large and peculiar Pecten occurred at stations 873 and 

 874. They closely resemble, in sculpture, the P. opercularis of Europe, 

 except that the large ribs are triangular and carinated at summit? 

 instead of rounded. These large ribs are separated by equally wide, 

 concave interspaces, which, like the ribs, are marked by slightly con- 

 cave, radiating furrows, and the surface of these furrows is covered with 

 thin, concentric, slightly raised, w^avy plates, the weaves being limited 

 by the fine radiating ridges between the grooves. Interior of valves 

 with broad, flat grooves, alternating with flat ribs of the same width* 

 Color grayish white, the ribs pale reddish. 



List of species enumerated in the preceding article. 



fOiic asterisk sifinifies that the species is an addition to the New England or North American fauna; 

 two, that it is a newly discovered species ; E ^ Euroiiean ; G = Greenlandic ; M := middle region of 

 New England, or both north and south of Cape Cod; N = northern coasts of America (Cape Cod to 

 Labrador) ; s= southern ; o =^ oceanic ; P = North Pacific. ] 



Bela rugulafa (Miiller). 

 Bcia simplex (Middend.). 

 Bela hebes Verrill. 

 Pleurotoma Agassizii V. & S. 

 Pleurotoma Pandionis V. & S. 

 Pleurotoma Carpenteri V. &l S. 

 Taranis pulchclla V. 

 Taranis Morchii (Malm) Jeff. 

 Marginella roscida f Rav. 

 Tritonofusus latericeus (Moll.) 



Morcli. 

 Nc2)tunca (Sipho) ccelata Verrill. 



