PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 403 



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

 ally, increasing in strength 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 fine, 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:, 305 to 500 fathoms, common. 



Limcca (jihha { = Lima yibba Jeffreys, op. cit., p. 428) also diflers but 

 little from our specimens. 



Pecten fenestratus Forbes (?). 



Report on Mollusca, &.C., of ^geau Sea, p. 14G, in Proc. British Assoc, for 1843. 

 Pecten inequisculptus Tiberi (teste Jeffreys). 



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

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

 Mediterranean deep-water species. In our two examples the upper 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. opercularis). 



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, wavy plates, the waves 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. 



fOnc asterisk sipiifies that the species is an addition to the New England or North American fann.i; 

 two, that it is a newly discovered 8])ecies ; E = European ; 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:=sonthem; o^ oceanic; P =: North Pacific. 1 



Bela rugulafa (Moller). 

 Bcla simjylex (MiddencL). 

 Bela hebcs Verrill. 

 Plenrotoma Jgassizii V. & S. 

 Pleurotoma Pandioiiis V. & S. 

 Plenrotoma Carpcnteri V. & S. 

 Taranis pulclwlla V. 

 Tarania Morchii (Malm) Jeff. 

 Marfjinella roscida ? Rav. 

 Tritonofusus laterlceus (Mcill.) 



Morch. 

 Xcptunea (Sipho) ccelata Verrill. 



