NEW FRESH WATER AND LAND SHELLS. 183 



Melania concinna. Plate 6, Fig. 42. 



Testa plicatd, turrito-acutd, subtenui, fused ; spird exsertd ; suturis impressis; anfractibus novenis, 

 carinatis, planulatis; aperturd parvd, ellipticd, ad basim angulatd, intus albidd. 



Shell folded, acutely turrited, thin, brown; spire drawn out; sutures impressed; whorls nine, carinate, 

 flattened ; aperture small, elliptical, angular at the base, whitish. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .25, Length .75 of an inch. 



Remarks. — A single individual only was received from Dr. Troost. Its mouth 

 is about one-fourth the length of the shell. It is remarkably flattened on the 

 whorls, and the superior part is transversely striate. 



Section III. — Carinate Melani^e. 

 Melania Babylonica. Plate 6, Fig. 43. 



Testd earinatd, turritd, subcrassa; spird subelevatd, prope apicem striatd; suturis impressis; anfrac- 

 tibus septenis, supernl angulatis; aperturd subgrandi, ellipticd, albd. 



Shell carinate, turrited, rather thick ; spire rather elevated, striate at the apex; sutures impressed; whorls 

 seven, angular above ; aperture rather large, elliptical, white. 



Hab. Yellow Springs, Green Co., Ohio. T. G. Lea. 



My Cabinet. 

 Diam. .36, Length .78 of an inch. 



Remarks. — A single specimen only of this shell has come under my notice. 

 If the prominent character of this specimen, the large carina on the superior 

 part of the whorls, be persistent, it marks a very distinct species. On the first 

 four whorls, the strise are well defined. On the remaining three the carina 

 alone exists. The aperture is more than one-third the length of the shell. 



Melania exarata. Plate 6, Fig. 44. 



Testd earinatd, conica, subcrassa, nigra; suturis exaratis; anfractibus planulatis, carinatis; aper- 

 turd parvd, ad basim angulatd et canaliculatd, intus tenebrosd. 



VIII. — 2 w 



