276 BULLETIN OF THE 



gether different from Circe, and those forms of Cytherea which have somewhat 

 similar teeth have the beaks and ligament different, and an angular pallial 

 sinus. It seems to be worthy of a section to itself. 



Genus VENUS Linne. 



Venus pilllla Reeve. 



V. pilula Reeve, Conch. Icon. Venus, pi. xv. fig. 58, 1863. 



Valves were obtained by Sigsbee, off Havana, in 80 fms., and at Station 272, 

 in 76 fms., Barbados, which appear to be referable to this species. 



Subgenus CHIONE Megerle v. Muhlfeldt. 



Venus (Chione) pygmsea Lamarck. 



Venus pygmcea Lam., An. s. Vert., 2me ed., VI. p. 337. Desh. Cat. Biv. Brit. Mus., 



p. 129. 

 Venus incequivalvis D'Orbigny, Moll. Cuba, p. 277, pi. xxvi. figs. 38-40, 1846. 

 Venus irapezoidalis Kurtz, Cat. N. and S. Car., p. 5, 18G0 (fide Stm.). 



Habitat. Station 26, 110 fms., in the Gulf of Mexico ; Yucatan Strait, 640 

 fms. (valves). 



The shell is found living in Charleston Harbor and southward. 



Venus (Chione) cancellata Lamarck. 



V. cancellata Lam., An. s. Vert., V. p. 588, 1818. (1 = V. dysera Linne.) 



Habitat. Gordon Key, 68 fms. ; off Havana, in 127 fms., drifted valves. 

 It is abundant on the Floridian and Antillean coasts in moderate depths of 

 water. 



Family PETRICOLIDiE. 



Genus PETRICOLA Lamarck. 



Petricola divaricata Chemnitz. 



Petrkola divaricata (Chemn.) D'Orbigny, Moll. Cuba, II. p. 265, 1853. 



One valve was obtained by the "Bache" in 68 fms., near Gordon Ke3% The 

 species is not rare, in proper places, in South Florida and through the whole 

 Antillean region. 



