VO l889. n ] PROCEEDINGS OF THE NATIONAL MUSEUM. 271 



Suborder VENERACEA. 



Family VENERID2E. 



Genus VENUS Linn6. 



Subgenus CHIONE Mublfeldt, 



Chione cancellata Linne\ 



This well known species, which ranges north to Cape Hatteras, was 

 collected at Port Castries, Santa Lucia Island, West Indies; at Station 

 2758, 90 miles southeast from Cape San Roque, Brazil, in 20 fathoms, 

 shelly bottom ; and at the Abrolhos Islands, off the coast of Brazil, near 

 Bahia. 



Chione rugosa Gmelin. 



This species, which is known from Hatteras south to Rio Janeiro and 

 on both coasts of Central America, was obtained at Station 2758. 



Subgenus ANAITIS Romer. 



Anaitis varicosa Sowerby (1853). 



This species, which is abundant off Hatteras and fossil in several of 

 our tertiary strata (under various names), was collected at Station 

 2758. It is very close to if not identical with Venus alveata Conrad, 

 1831. 



Genus CYTHEREA Lamarck. 



Cytherea hebraea Lamarck. 



Young specimens of this species were obtained at Station 2758. 



Cytherea eucymata, sp. no v. 



Plate xm, Fig. 11. 



Cytherea sp. (No. 200) Dall, Bull. U. S. Nat. Mus., No. 37, pp. 50,57, August, 1889. 



Shell thin, inflated, concentrically ribbed, waxen white or pale 

 brown, with clouds and zigzag fluctuations of madder brown, polished ; 

 adult with about fifty rounded slightly flattened concentric waves with 

 a short dorsal and long ventral slope, separated by narrow sharp 

 grooves; these waves become fused in pairs or alternately obsolete and 

 raised into more thin and elevated lamellae near the posterior dorsal 

 margin ; radiating sculpture none, except a narrow ridge bordering the 

 ligamental furrow and the groove which circumscribes the lanceolate 

 lunule ; there is no escutcheon ; margin elegantly rounded, a little 

 straighter along the ligamental border, outline ovate; beaks full, not 

 prominent; hinge of the genus; the lateral tooth conic in the young, 

 compressed in the adult; margin rounded, smooth; pallial sinus not 

 quite reaching the vertical from the beaks, rounded or subtruncate at 



