250 LAND AND FRESH-WATEU SHELLS OF N. A. [PART IV. 



them are without epidermis and then present a livid bhiish- 

 white api)earance. Considerable variation may be noticed in 

 the fornj of the shell and in its texture. It is an exceedingly 

 numerous species inhabiting the waters of the Northwestern 

 States. Dr. Brot proposed the name correcta instead of cicspi- 

 data, Anth., preoccupied iu Melania. 



144. G. Milesii, Lea. 



Goniobasis Milesii, Lea, Proc. Acad. Nat. Sci., p. 154, May, 1803. 



Description. — Shell smooth, subfiisiform, olivaceous, without bands; 

 spire subclevated ; sutures irregularly impressed; whorls six, sub- 

 Fig. 487. inflated ; aperture rather large, subrhomboidal, browuish 

 within ; lip acute, scarcely sinuate ; columella purplish, 

 slightly incurved. 



Habitat. — Tuscola County, Michigan; M. Miles, State 

 zoologist. — Lea. 



This species is certainly very closely allied to Uvescens in 

 many respects but appears to be more convex in the whorls, 

 and to attain a larger size. I am by no means satisfied that 

 it is distinct, however. 



145. G. simplex, Say. 



Melania simjylex, Say, Jour. Acad. Nat. Sci., v, p. 120, Sept. 182.5. Binxey's edition, 

 p. 115. IJiNNEY, Check List, No. 2U. DeKav, MoU. N. Y., p. 100. Wheat- 

 ley, Cat. Shells U.S., p. 27. Reeve, Monog. Melania, sp. 148. Jay, Cat., 4th 

 edit., p. 275. Brot, List, p. 38. 



Pachycheilus simplex, Say, Adams, Genera, i, p. 208. 



Melania Warderiana. Lea, Philos. Proc.,ii, p. 14, Feb., 1841. Philos. Trans., vili, p. 

 185, t. C, f. 47, Obs., iii, p. 23. DkKay, Moll. N. Y., p. 91). Catlow, Conch. 

 Nomenc, p. 189. BixxEY, Check List, No. 297. BuoT, List, p. 39. Reeve, 

 Monog. Melania, ep. 353. 



Melania Wardiana,'Lefi, Wheatley, Cat. Shells U.S., p. 27. 



Potadoma Warderiana, Lea, Chenu, Manuel de Conchyl., i, f. 1972. Adams, Gen- 

 cr.i, i, p. 299, Cuenu. Manuel, i, f. 1972. 



Melania densa, AXTHOXY, Bost. Proc. iii, p. 360., Dec. 1850. BlXXEY, Check List, 

 No. 89. Brot, List, p. 31. Reeve, Mouog. Melania, sp. 250. 



Melania suhsolida, Philos. Proc, ii, p. 12, Feb.. 1841. Philos. Trans., viii, p. 168, t. 

 5, f. 12. Obs., iii, p. 6. TuoosT, Cat. Shells Tenn. Bixney, Check List, No. 

 255. Wheatley, Cat, Shells U.S., p. 27. DeKay, Moll. N. Y., p. 94. Catlow, 

 Conch. Nomenc, p. 188. Brot, List, p. 39. 



Potadoma subsolida, Lea, H. and A. Adams, Genera, i, p. 299. 



Goniobasis Vannxemii,* Lea, Proc. Acad. Nat. Sci., p. 265, 1802. Jour. Acad. Nat. 

 Sci., V, p. 307, t. 37, f. 146. Obs., ix, p. 129. 



* Changed to G. Presloniana, Lea, Proc. Acad., 1864, p. 3. 



