164 



LAND AN1> FRESH-WATEK SHELLS OF N. A. [PART IV, 



Fig. 313. Fig. 314. 



Observations. — Closely resembles the youug of lo spinosa, and differs 

 from the young of Melania nupera as figured by Say (Am. Conch., pi. 

 3), by the want of the concentric elevated lines on 

 the anterior slope. This figure, as I am informed by 

 Mrs. Say, docs not represent the young of the prin- 

 cipal figures {Lithasia niipera), but another species 

 which, if distinct, will retain the name of 31. nupera, 

 as it appears to be a true Melania. — Haldcman. 



The two figures, representing a young and 

 adult shell, are from Prof. Ilaldeman's types. The peculiar 

 form of the aperture distinguishes all the specimens I have 

 seen. Somewhat allied to carinocostata, Lea, but in that 

 species the plic£e are terminated by a rib or angle on the 

 bodj'-whorl and the spire is angled or carinate. The largest 

 specimen I have seen attains ^ inch. 



29. G. semigradata, Reeve. 



Melania semigradata, Keeve, Mouog. Melania, sp. 473, May, 18G1. Brot, List, p. 33. 



Description. — Shell pyramidal!}' conical, fulvous-olive, encircled 

 with a green baud ; whorls 5-G, flatly sloping, sharply pj^.^ gjg^ 

 keeled around the lower part, first few whorls longi- 

 tudinally plicated, last whorl double-keeled; aperture 

 ovate, a little effused at the base. 



Habitat. — 'Alabama, United States. 



Observations. — A striking new species, in which the 

 whorls are double-keeled at the periphery, the lower keel 

 being hid in all but the last whorl by the overlapping of one whorl 

 upon another. — Beeve. 



Very closely related to G. Gerhardtii. 



30, G. carinocostata. Lea. 



Melania carinocostata, Lea, Pliilos. Proc. iv, p. 165, 184.5. Philos. Trans., x, p. G2, 



t.9, f. 40. Obs., iv, p. 62. UixNEY, Checli List, No. 49. Brot, List, p. 35. 



Kekve, Monog. Melania, sp. 333. 

 Elimia carinocostata. Lea, Adams, Genera, i, p. 300. 

 Goniohasis strenua, Lea, Proc. Aoad. Nat. Sci., p. 267, 1862. Jour. Acad. Nat. Sci., 



V, pt. 3, p. 316, t. 37, f. Kil, March, 1833. Obs., ix, p. 138. 

 Goniobasis Leidyana, Lea, Proc. Acad. Nat. Sci., p. 268, 1882. Jour. Acad. Nat. 



Sci., V, pt. 3, p. 322, t. .38, f. 173, Marcli, 1833. Obs.. ix, p. 144. 

 Melania scnhrella, Anthmy, Reeve, Monog. Melania, sp. 388. 

 Melania scabriuscula. BuoT, List, iJ. 30. 



