178 DESCRIPTION OF 



RemarJcs. — This is a small, folded species of which a single specimen was 

 received from Dr. Troost. The superior whorls are carinated. The folds 

 extend to the body whorl. The aperture is rather more than one-third the 

 length of the shell. 



Melania monozonalis. Plate 6, Fig. 31. 



Testa plicatd, fusiformi, subcrassd, fasciatd, pallida ; spird ohtusd; suturis linearibus; anfractihus 

 quinis, suhconvexis; aperturd magnd, ellipticd, infra angulatd, alba. 



Shell folded,fusiform,rather thick, banded, light-coloured; spire obtuse; sutures linear; whorls five, rather 

 convex; aperture "iarge, elliptical, angular at base, white. 



Hab. Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. 21, Length .42 of an inch. 



Remarks. — But a single specimen of this was sent to me by Dr. Troost. It 

 is a very distinct species, and remarkable for a single broad band on the upper 

 part of the whorl. In other specimens this band may not always be found to 

 present the same character; and the number of bands in others again may 

 even be increased. The aperture is about one-half the length of the shell. 



Melania terebralis. Plate 6, Fig. 32. 



Testd plicatd, acutoturritd, subtenui, nitidd, rufo-fuscd; spira valdt elevata; suturis valdt impressis; 

 anfractibus novenis, convexis, supernl carinatis; aperturd parvd, elliptica, albida. 



Shell folded, acutely turrited, rather thin, shining, reddish brown; spire much elevated; sutures much 

 impressed ; whorls nine, convex, carinate above ; aperture small, elliptical, whitish. 



Hab Tenn. Dr. Troost. 



My Cabinet, and Cabinet of Dr. Troost. 

 Diam. .24, Length .67 of an inch. 



B-emarhs. — This species differs in the form of the folds from any which have 

 come under my notice. These folds are distant from each other, but slightly 

 raised, and give the shell a varicose appearance. The mouth is about the fifth 

 part of the length of the shell. 



