MUSEUM OF COMPARATIVE ZOOLOGY. 131 



nutely crenate in perfectly adult specimens, though smooth in the young. It 

 has, as will be observed, a very considerable range in depth. 



Crassatella antillarum (?) Reeve. 

 Reeve, Conch. Icon., I. Mon. Crassatella, PI. III., 1845. 



Gulf of Mexico, west of the Florida coast, in 30 fms. 



Shell thin, compressed, light brown, with about six strong concentric undu- 

 lations, a rosy streak extending from the beaks outside and coloring the inte- 

 rior, having much the shape of C. Robinaldina, and a length of II. mm., with 

 a height of 6.75 and a width of 2.5 mm. It may take the varietal name of 

 Floridana until more nearly adult specimens are accessible, but I strongly sus- 

 pect it will eventually prove distinct from the above species, to which it is pro- 

 visionally referred. 



Crassatella (Eriphyla) parva C. B. Adams. 



Thetis parva C. B. Adams, Proc. Best. Soc. Nat. Hist., II., Jan. 1845, p. 9. 



Gouldia parva C. B. Adams, Cat. loc cit., p. 29, 1847. 



Gouldia fastigiata Gould, Proc. Bost. Soc. Nat. Hist., VIII. p. 282, 1862. (North 



CaroHna.) 

 Astarte Pfciffcri Phil., Zeitschr. fiir Mai., V. 133, 1848. 

 Crassatella viartinicensis D'Orbigny, Sagra, Moll. Cuba, II. 288, PI. XXVII. figs. 



24-26, 1853 ; "1846." 

 Crassatella guadaloupcnsis D'Orbigny, loc. cit., p. 289. PL XXVII. figs. 24-26, 1853 ; 



"1846." 



Martinique, Jamaica, St. Domingo, Cuba, St. Thomas (D'Orbigny) ; Cuba 

 (Pfeiffer); Jamaica (Adams); Station 21, 287 fms.; Station 44, 539 fms.; 

 Station 33, 1,568 fms. (Blake Exp.). 



This seems perfectly distinct from G. (E.) mactracea Linsley, which is iden- 

 tical with Astarte lunulata Conrad (Journ. Acad. Nat. Sci.. VII. p. 133, 1834), 

 from the postpliocene of Virginia and North Carolina. That the two forms 

 figured by D'Orbigny are mere individual variations, is well shown by the 

 series I have examined. Gould's species seems rather to belong here than with 

 C. mactracea. In any case, Conrad's name is long prior to any of the others. 

 A form almost identical with C. parva is Prof Adams' C. pacifica from Pan- 

 ama, of which C. varians Carpenter seems to be only a Northern race. 



Cardium serratum Linne. 



Cardium serratum Reeve, Conch. Icon. Cardium, PL I. fig. 1, 1844. 



West of Florida, in 30 fms., Bache ; Barbados, 100 fms. ; Sigsbee, off Ha- 

 vana, 127 fms. 



This is the Cardium citrinum of Wood ; the specimens obtained were all 

 rather young. 



