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



whorl; body-Tvhorl large, ventricose, Tvith a very obtuse, slightly 

 impressed, revolving baud; aperture suboval, above acute and ef- 

 fuse ; within on the side of the exterior lip about four revolving, 

 purplish Hues, sometimes dotted, sometimes obsolete or wanting; 

 labium thickened, particularly at the superior termination near the 

 angle, and tinged with purplish; base of the columella somewhat 

 elongated and incurved, meeting the exterior lip at an angle. 

 Habitat. — Inhabits Ohio River. 

 Length, about four-lifths of an inch. 



Observations.— ^onnA in plenty at the foils of the Ohio. The spire 



is remarkably curious in the older shells, and the penultimate whorl, 



between the aperture and the spire, is also remarkably eroded in 



many older shells. The spire in the young shell is entire, and but 



Fig. 809. Fig. 810, Fig. 81L little prominent, though acute, 



and the bands are distinct on 

 the exterior of the shell. This 

 shell docs not seem to corre- 

 spond with the genus to which 

 I have for the present referred 

 it, and owing to the configuration 

 of the base of the columella, if it is not a Melanopsis, it is probable 

 its station will be between the genera Melania and Acathina. I pro- 

 pose for it the generic name of Anculosa. — Say. 



The various species described by Menke and Desha3'es all 

 appear to be synouymes of jircerosa judging from the descrip- 

 tions, translations of which are here given. Prof. Halderaan 

 and Mr. Anthony both agree with me in this opinion. Melania 

 Cinci7inatiensiSy Lea, is only a quite young prcerosa, as is 

 proved by the extensive suite of specimens before me, for 

 which I am indebted to Mr. Anthony. Angiilatus, Conrad, 

 represents, as Professor Haldeman truly remarks, a half grown 

 shell in which the carina still lingers. This variety is found 

 only in Alabama. The species is very common, and ranges 

 through Ohio, Indiana, Kentucky, Tennessee, northern Geor- 

 gia and Alabama. 



Melania angiilosa. — Shell ovate, truncated, perforated, variable, 

 striate, greenish-brown; whorls five, the last obsoletely augulated 

 above; columella callous, violaceous; lip acute, produced against 

 the columella above. 



