145 



widely and regularly rounded, without any protrusion near the 

 base : base slightly angulated, without any sinus or undulation : 

 umbilicus none. 



Inhabits Falls of the Ohio. Length, less than half an inch. 

 Var. a. Inferior band obsolete. Var. h. Bands obsolete. 



This species is allied to the preceding, but is obviously dis- 

 tinct in its general appearance ; the volutions are destitute of a 

 shoulder, and the aperture is ovate, acute above. It is a pretty 

 shell, the bands being very conspicuous, strongly contrasting with 

 the yellow general color, particularly in the young and half grown 

 shell. 



I obtained about a dozen specimens on the rocky flats of the 

 Falls of the Ohio, at the lower end of the island which is nearest 

 to Louisville. 



Melania depygis. — Shell oblong conic ovate, not remarkably 

 thickened : spire as long as the aperture, or rather longer, much 

 eroded, with a broad revolving band near the suture, occupying 

 more than half the surface : whirls about five, hardly rounded : 

 suture moderately impressed : body whirl yellowish, with two 

 equidistant rufous, revolving lines, of which the superior one is 

 much broader and its locality a little flatter than the general cur- 

 vature : aperture ovate, acute, above, moderately dilated : labium 

 with calcareous deposit, particularly above : labrum not projecting 

 near the base, nor arquated near its junction with the second volu- 

 tion : base regularly rounded. 



Inhabits Falls of the Ohio. Length half an inch ; breadth, 

 nearly a quarter of an inch. Var. a. Color dark brown ; bands 

 obsolete. 



I found this species in great abundance on the rocky flats at the 

 Falls of the Ohio, where they were left by the subsiding of the 

 river, in company with numerous other shells. In old specimens 

 the spire is very much eroded ; the eroded part is white. 



Paludina transversa. — Shell transverse, depressed, orbicu- 

 lar : spire convex : whirls three and a half; with numerous minute, 

 slightly elevated revolving lines : suture not widely indented : body 

 whirl very convex, short : umbilicus small : operculum pale fulvous- 



Grreatest width, two-fifths of an inch. Inhabits Louisiana. 



We obtained two specimens in the marshes near New Orleans. 

 It is much wider in proportion to the length than any other species 



