INSTITUTE OF SCIENCE, PHILADELPHIA. 377 



whorls, and generally small size. They are so far all Eocene species, and in- 

 clude A. alabamieiisis Whitfield, the type, and A. erecia Whitfield, of which 

 Natica {Ejispird) prouwveiis De Gregorio is probably a very young specimen. 



Subgenus Amauropsis Morch. 



This group has a normally naticoid animal, but Ainaura MoUer has an 

 animal with particular characters of its own, separating it generically from 

 Natica or Polynices. Notwithstanding this, Ainaura and Bulbus (or Acrybia, 

 which is again a true /'(?/c«2c^.f, differing at most subgenerically from the latter) 

 and Amauropsis are generally lumped together as a group by themselves in 

 the systematic manuals, etc. This illogical proceeding seems to have resulted 

 chiefly from the fact that the recent species are all Arctic shells. 



Polynices (Amauropsis) perovatus Conrad ? 



AmpuUaria? perovata Conr., Proc. Acad. Nat. Sci. iii. p. 21, pi. i, fig. 16, 1846. 



Lupia perovata Conr., Am. Journ. Conch, i. p. 27, 1S65 ; Smithsonian Eoc. Checklist, p. 15. 



? Natica [Eiispira) propecotiica De Greg., Mon. Claib., p. 153, pi. 15, figs. 7 a, 7 b, 1S90. 



Claibornian Eocene, Conrad and De Gregorio ; " white limestone " of the 

 Jacksonian at Claiborne, Alabama, Whitfield ; Newer Eocene of the Ocala lime- 

 stone at Ocala, Florida, Willcox ; and Older Miocene of Chipola River, Cal- 

 houn Co., Burns. 



De Gregorio's figure, if I have correctly identified his species, is not \'ery 

 good, as the sutures are more distinctly and widely channelled than his draw- 

 ings indicate, and therefore, in profile, have a more turrited look. The shell 

 is thin, imperforate, smooth, with a thin callus on the pillar and a narrow 

 fasciole behind the pillar which recalls Ainpullina. There can be no doubt of 

 the identity of the specimens before me as one and the same species, but it is 

 possible that De Gregorio's type may be different, in which case our present 

 form may take the name of ocalana. Conrad's figure is very poor, yet I think 

 the chances are in favor of the correctness of the identification. 



Polynices (Amauropsis) Burnsii n. s. 

 Plate 22, figure 33. 



Older Miocene of the Chipola River, one mile below Bailey's Ferry, 

 Calhoun Co., Florida, Frank Burns. 



Shell ampullarise-form, solid, smooth except for periodically impressed 

 lines of growth ; with seven or eight whorls ; apex depressed, minute, pointed ; 

 suture distinct, with a wide channel in front of it ; whorls in front of the 

 channel evenly rounded, full, and smooth ; base rounded, imperforate, the 

 pillar with a very narrow fasciole ; aperture subovate, not very oblique, the 

 lips thickened and reflected, joined over the body by a continuous callus. Alt. 

 of shell 18 ; max. diam. 15 mm. 



This elegant shell resembles the preceding species, but is much more de- 



