106 



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



FiR. 200. 



49. P. pyrenellum, Conrad. 



Melanin pijreneUa, Coxrad, New Fresh Water Shells, p. 52, t. S, f. 5, 1831. DeKat, 

 Moll. X. Y.. p. 99. WnEATi.EY, Cat. Shells U. S.. p. 2G. BixsEV. Cheek List, 

 No. 22!). Brot, List, p. 30. Keeve, JNIonog. Melauia, sp. 303. Mullek, 

 Synopsis, p. 45. 



Description. — Shell elevated, with flattened whorls, having an obso- 

 lete spiral line on each; suture impressed; body-whorl 

 angulated ; angle defined by a prominent line ; base hardly 

 convex, labrum angulated near the centre ; aperture patu- 

 lous ; columella obtusely rounded at the base. 



Observations. — Inhabits streams in North Alabama. The 

 aperture is remarkably patulous, and the labrum profoundly 

 angulated. — Conrad. 



The figure is that of Conrad's type ia the collec- 

 tion of the Academy of Natural Sciences. 



Fiff. 201. Fijr. 202. 



50. P. Conradii, Tryon. 



Description. — Shell narrow, lengthened, with nine flattened whorls, 

 which are angulated in the middle of the body 

 and just above the suture of the spire. Dark 

 brown, smooth, apical whorls, slightly carinate. 

 Aperture small, not produced below, fuse short, 

 scarcely perceptible. 



Diameter, -36; length, 1 inch. 



Habitat. — Tennessee. — Tryon. 



This shell has been distributed very exten- 

 sively in cabinets under the name of Melania jjyreneUa., Con- 

 rad. It is, however, a much narrower species and darker in 

 color. 



51. P. regulare, Lea. 



Melania regularis, Lea, Philos. Proc, ii, p. 12, Feb., 1841. Philos. Trans., viii, p. 



170, t. 5, f. 16. Obs., iii, p. 8. DeKay, Moll. N. Y., p. 94. Higgins, Cat. 



Troost, Cat. Jay, Cat., 4th edit , p. 274. Wheatley, Cat. Shells U. S., p. 2(5. 



Binney, Check List, No. 227. Catlow, Conch. Nomenc, p. 188. Brot, List. 



p. 30. 

 Ceriphasia regularis. Lea, Chenu, Manual, i, f. 1956. Adams, Genera, i, 297. 



