84 



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



Fig. 157. 



boidal, rather narrow, pale brown within ; outer lip acute, sinuous ; 

 columella thickened below and twisted. 



Habitat.— Alaharan? J. C. Jay, M.D. 

 Diameter, -40; length, 1-16 inches. 



Observations. — A single specimen was given to me many 

 years since by Dr. Jay under the name of Melania prasi- 

 nata, Con., but it is a very different shell from the type of 

 that species in the collection of the Academy of Natural 

 Sciences, that being of a greenish color, having a few 

 nodes round the periphery, which is angulated, neither of 

 which characters belongs to Jaiji. Indeed, our shell is 

 much nearer to claitsa (nobis) in outline, but it is not so pupasform, 

 and it has a more twisted columella, the spire being more conical. 



It is to be regretted that a single specimen only should be under 

 observation, as others may be different in color. The interior as well 

 as the columella is of a dull salmon, and the darkness is occasioned 

 by obscure bands which do not extend quite to the edge, which is 

 slightly thickened. The aperture is not quite one-third the length of 

 the shell. I name this species after Dr. Jay, to whom I owe the pos- 

 session of it, and who has done so much to advance a knowledge of 

 our conchology. — Lea. 



Fig. 158. 



26. P. tortum, Lea. 



Trypanostomn tortum, Lea, Proc. Acad. Nat. Sci., p. 174, 1862. Jour. Acad. Nat. 

 Sol., V, pt. 3, p. 275, t. 36, f. 89. Obs., ix, p. 97. 



Description. — Shell smooth, conical, horn-color, rather thick; spire 

 rather obtusely conical ; sutures very much impressed ; whorls seven, 

 flattened; aperture rather large, subrhomboidal, white or 

 brownish within; outer lip acute, scarcely sinuous; colu- 

 mella very much incurved, slightly thickened above, more 

 thickened below and very much twisted. 



Habitat. — Little Uchee, below Columbus, Georgia; G. 

 Hallenbeck. 



Diameter, -44 ; length, -OG of an inch. 



Observations. — Several specimens of this species are 

 before me. In or.e of the specimens there are three or four obscure 

 striae about the periphery. It is probable that others may be found 

 with this character more developed. On the upper whorls there is a 

 raised line revolving immediately above the suture, which causes the 



