GONIOBASIS. 193 



remiuded of CohimbeUa avara, Say, which it resembles, both ia size 

 and general appearance. The bands allnded to are often interrupted 

 and never very fully expressed; body- whorl subangulated below the 

 middle; does not seem to be a very abundant species. Only six indi- 

 viduals are before me. — Anthony. 



Fig. 378 is from Mr. Anthony's tj'pe. The shell is not 

 entirely adult, probably, but I cannot assimilate it to any 

 other species. A number of specimens are before me, which 

 are very uniform in character ; in one, however, the bands are 

 three in number, broad and dark. This shell inhabits Black 

 Warrior River, Alabama, — teste Showalter. 



70. G. nassula, Coxrad. 



Melanin nassula, Conrad, New Fresh-Watei- Shells, p. 55, t. 8, f. 9, 1834. Binnet, 

 Check List, No. 171. DeKay, Moll. New York, p. 97. Jay, Cat. -ith edit., p. 

 274. Wheatley, Cat. Shells, U. S., p.26. Brot, List, p. 34. Keeve, Monog. 

 Melania, sp. 412. Catlow, Couch. Nonienc, p. 187. 



Mdania Edgariana, Lea, Philos. Proc, ii, p. 14, Feb., 1841. Philos. Trans., viii, 

 p. 180, t. 6, f. 37. Obs., iii, p. 18. DeKay, Moll. N. Y., p. 97. Jay, Cat. 4th 

 edit., p. 273. Bixxey, Check List, No. 94. Troost, Cat. Shells, Teuu. Reeve, 

 Monog. Melania, sp. 430. Wheatley, Cat. Shells, U. S., p. 25. Catlow, 

 Conch. Nonienc, p. 186. 



Melasma Edgariana, Lea, Chenu, Man. de Conchyl, i, f. 1997. 



Description. — Shell elevated; whorls convex or subangulated, with 

 longitudinal ribs, crossed by numerous, spiral, elevated lines, 

 about seven on the penultimate whorl, and about eleven on ^'S' ^'^' 

 the body- whorl ; suture impressed ; apex much eroded. 



Habitat. — Inhabits the limestone spring at Tuscumbia, Ala. 



Observations. — Immense numbers of this pretty species 

 congregate on the rocks where Spring Creek finds a passage 

 through a cavern of the carboniferous limestone. — Conrad. 



The figure is from an author's example in collection of 

 Anthony. I have also examined author's examples in collec- 

 tions of Haldeman and Gen. Totten, which are shorter in 

 consequence of the erosion of the apices. This shell is allied 

 to G. formosa., Con., but has no bands. 



Mr. Lea agrees with me that his Ed(jariana is a synonyme 

 of nassula. The following is his description : — 



Melania Edgariana — Shell folded, conical, rather thin, striate, yel- 

 13 



