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 11.0 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. Bost. Soc. Nat. Hist., II., Jan. 1845, p. 9. 



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



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



Carolina.) 

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

 Crassatella marlinicensis D'Orbigny, Sagra, Moll. Cuba, II. 288, PL XXVII. figs. 



24-26, 1853 ; "1846." 

 Crassatella guetdaloupensis D'Orbigny, loc. tit., p. 289. PI. 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 C. (E.) mactracca 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 t lie others. 

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

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



Cardium serratum Lnras. 



Cardium serratum Reeve, Conch. Icon. Cardium, PI. I. fig. 1, 1S44. 



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

 vana, li'T fms. 



This is the Cardiu m citri/ium of Wood; the specimens obtained were all 

 rather young. 



