108 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



AMPULLINA AMPHORA Heilprin. 

 Plate 11, fig. '5. 



Natica amphora Heilprin, Trans. Wagner Inst., voL 1, pp. 112, 120, pi. 16, 



fig. 50, 1887. 

 Anvpullina {Ampiillinopsis) amphora Dall, Trans. Wagner Inst., vol. 3. pt. 



2, p. 375, 1892. 



Oligocene of the Tampa silex beds at Ballast Point (Stearns, Heil- 

 prin) and of the overlying limestone, and of the Chipola marl of 

 Calhoun Coimty, Florida. U. S. Nat. Miis. No. 165133. 



This bears to the A. mississippiensis Conrad, much such a relation 

 as the A. maxima of France does to the typical A. crassatina of the 

 Parisian Eocene. The basal fasciole is narrower and defined by a 

 more distinct line than in A. mississippiensis^ which otherwise it 

 much resembles. 



AMPULLINA SOLIDULA Dall. 



Plate 3, fig. 10. 



AmpuUina solidula Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 370, pi. 22, 

 fig. 31, 1892. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida; Dall, 

 U. S. Nat. Mus. No. 112933. 



Only a single specimen has been obtained, which is a very solid 

 shell, much more so than A. streptostoma of the same size, and with 

 a different umbilicus. 



Genus AMAUROPSIS Morch. 



Amauropsis Mobcii, Moll. Gronl. Nat. Bidr. Beck's Gronl., 1857, p. 81, sub- 

 genus of Mamma. Sole example, Nerita islandica Gmelin ; see Conchyl. 

 Cabinet, vol. 1, p. 215, fig. 1181. 



This group has a thin elevated shell, with a channeled suture and 

 a horny operculum, a conspicuous periostracum (dehiscent in the 

 typical species) and in the recent fauna is confined to the boreal 

 seas. Amaura Moller, often associated with it, belongs to the 

 Pyramidellidae. 



AMAUROPSIS FLORIDANA Dall. 

 Plate 5, fig. 11. 



Amavra guppyi (Gabb) Heilprin, Trans. Wagner Inst., vol. 1, p. 112, 1887. 

 PoUnices (Amau/ropsis) (gup-pyi Gabb var. ?) floridana Dall, Trans Wag- 

 ner Inst., vol. 3, pt 2, p. 378, 1892. 



Tampa silex beds at Ballast Point Tampa Bay, Florida, Dall and 

 Willcox. U. S. Nat. Mus. No. 112955. 



The differences noted in the Wagner memoir seem sufficient to 

 distinguish the Floridian from Gabb's Antillean species. 



