136 BULLETIN OF THE 



Lucina antillarum Reeve. 



Lucina antillarum Reeve, Conch. Icon. Lucina, PL X. lig. 37, 1850. 



Lucina pecten Reeve, loc. ciL, PL VII. figs. 34, 35 ; not of Lamarck teste Reeve. 



Lucina occidentalis Reeve, loc, cit., in errata. 



Charlotte Harbor, Florida, 13 fms.; Sigsbee, off Havana, in 182 and 450fnis. 

 Yucatan Strait, 640 lni«. 



Lucina funiculata Reeve. 



Lucina funiculuta Reeve, loc. cit., PL VII. fig. 40, June, 1850. 



Station 2, 805 fms. 



A single young valve was obtained, probably of this species. 



Diplodonta venezuelensis Dunker. 



Diplodonta venezuelensis Dunker, Zeitsclir. fiir MaL, 1848, p. 184 ; Nov. Conch., 

 p. 3, Tab. IV. figs. 7, 8, 9, 1858. 



Yucatan Strait, 64.0 fms. 



One valve and part of another were obtained. 



Dipiodonta pilula n. s. 



Shell small, round, inflated, polished, with concentric sculpture of slightly 

 raised sharpish ridges ; umbos smooth, polished, prominent, inflated ; margins 

 not angulated, forming nearly a perfect circle, teeth indistinct ; margin smooth ; 

 epidermis if any thin and translucent. Lon. 2.6 ; alt. 2.6 ; diam. 2.6 mm. 



Station 43, 339 fms., living. 



This little shell resembles a homoeopathic pill as much as anything, and, 

 curiously enough, seems to be mature. The teeth are so indistinct that I feel 

 a slight doubt as to whether it is a Diplodonta or not. 



Cryptodon obesus (?) Verrill. 



Fragments of a Cryptodon were obtained in 640 fms., Yucatan Strait, which 

 bear some resemblance to C. obesus Verrill, though they do not agree with 

 more northern specimens in all respects. These Cryptodons, however, vary 

 considerably, and when fully compared it is probable that the number of nomi- 

 nal species will be reduced. 



