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



beautifully banded. 



Fig. 31. 



The following description by Mr. Reeve 

 is founded on a shell more than usually 

 noduled ; the figure is a copy from his 

 plate. 



lo verrucosa. — Shell fusiform, greenish-olive, 

 purple tinged and banded ; whorls six, sloping, 

 the first plicately crenulated, the rest tumidly 

 noduled at the periphery; columella atteuu- 

 ately elongated. 



Rahitat. — Tennessee. 



Observations. — In this species, which is of 

 a greenish hue, the periphery of the whorls is 

 furnished with a row of swollen, wart-like 

 nodules, the early whorls of the shell being 

 rippled with small concentric folds. — Beeve. 



2. I. inermis, Anthony. 



lo inermis, Anthony, Proc. Acad. Nat. Sci., Feb. 1860, p. 70. 



No. 401. Reeve, Monog. lo, t. .3. f. 21. 

 lo lurida, Anthony, Reeve, Monog. lo, t. 3, f. 20. 



BiNNET, Check List, 



Fig. 32. 



Description. — Shell conical, smooth, thick; moderately elevated; 

 composed of 7-8 flattened whorls ; suture very 

 distinct; upper whorls slightly coronated by 

 an obscure row of low spines, nearly con- 

 cealed by the preceding whorl; shell other- 

 wise perfectly smooth, or only occasionally or 

 obscurely nodulous on the body- whorl ; lines 

 of growth very strong and much curved; 

 aperture pyrifonn, curved to the left, banded 

 within; columella twisted, callous, thickened 

 above ; sinus long and curved. 



Length of shell, 2 1-16 inches; breadth of 

 shell, 1 inch; length of aperture, 1 inch. 

 Breadth of aperture, h inch. — Anthony. 



Remarkable mainly for its plain, un- 

 adorned exterior, and smooth epidermis ; 

 its color also is lighter than '■'■ spinosa" or '■'■fluviatilis." No 

 spines are visible on the body-whorl of this species generally, 

 but I have a few specimens which may perhaps belong to it, 



