138 LAKD AND FRESH-AVATER SHELLS OF K. A. [pART IV. 



impressed; whorls seven, slightly convex above, the last one very 

 much inflated ; aperture large, subrhomboidal, Avhite within ; outer 

 lip acute, sinuous ; columella thickened below and very much twisted. 

 Habitat. — Tennessee. 

 Diameter, -30; length, -ol inch. 



Observations. — This is one of the many species sent to me long since 



by my excellent friend the late Prof. Troost. There were but two 



specimens, and as they had very much the aspect of young 



Melania conica, Say, I refrained from describing them in hopes 



that others would be received. Feeling satisfied that it is a 



distinct species, I propose the name from its round, short 



form, somewhat like a turnip. One of the specimens has a 



purple spot at the base of the columella ; the other is devoid of it. 



The aperture is quite one-half the length of the shell. — Lea. 



Goniohasic Section. 

 Genus GONIOBASIS, Lea. 



Goniobasis, Lea, Proc. Acad. Nat. Sci., p. 2G2, May, 1862. Jour. Acad. 



Nat. Sci., V, pt. 3, p. 217; March, 18(J3. Obs. ix, p. 39. 

 Ceriphasia (sp.), Swainson, H. and A. Adams, Genera, i, p. 298, Feb., 



1854. CiiENU, Man. de Conchyl., i, p. 290, 1859. 

 Pachycheilus (sp.), Lea, H. and A. Adams, Genera, i, p. 298, Feb., 



1854. 

 Potadoma (sp-), Swainson, H. and A. Adams, Genera, i, p. 299, Feb., 



1854. Chenu, Man. de Conchyl., i, p. 290, 1859. 

 EUmia (sp.), H. and A. Adams, Genera, i, p. 300, Feb., 1854. Chexu, 



Man. de Conchyl., i, p. 290, 1859. 

 Melasma (sp.), H. and A. Adams, Genera, i, p. 300, Feb., 1854. Ciienu, 



Man. de Conchyl., i, p. 292, 1859. 

 Hemisinus (sp.), Swainson, II. and A. Adams, Genera, 1, p. 302, Feb. 



1854. 

 Jiiga (sp.), H. and A. Adams, Genera, i, p. 304, Feb., 1854. Chenu, 



Man. de Conchyl., i, p. 293, 1859. 

 Megara (sp.), H. and A. Adams, Genera, i, p. 30G, Feb., 1854. Chenu, 



Man. de Conchyl., i, p. 293, 1859. 

 Pleurocera, llafiuesque, Haldeman, Proc. Acad. Nat. Sci., p. 274, 



18G3. 

 Melania (sp.), Auct. 



