88 Descriptions of New Fluviatile Shells. 



6. Itlelania latitans. 



Plate II. Fig. 6. 



T. conica, tenui, fulvo-virente ; spira elevata ; anfr. 8-9, convexis, vel 

 subangulatis, transverse rude striatis, striis spiralibus impressis, inferne 

 obsoletioribus, fasciisque obscuris cinctis ; apertura rotundo-ovata, intus 

 rubescente et purpureo fasciata ; labro sinuoso ; columella incurva, pur- 

 purea, in sinum latum producta. 



Shell conical, obscurely striate, greenish brown, rather thin ; 

 spire elevated ; whorls 8-9, convex or subangulated, with three 

 or four obscure transverse stride above the angle, which become 

 obsolete below it, and one or two brown bands at and above the 

 middle of each turn ; sutures distinct; lines of growth coarse, 

 amounting almost to ribs on the lower whorls; aperture not 

 large, sub-rotund or very broad ovate, reddish within, and 

 banded ; columella very much curved and twisted, with a small 

 sinus at base. 



Length 1 inch (26 millim.). Diam. 0.39 inch (10 millim.). 



Length of aperture 0.34 inch (9 millim.). 



Breadth of do. 0.21 inch (5 millim.). 



Habitat. — Mammoth Cave, Kentucky. 

 My cabinet. 



Obs. — Bears no very strong resemblance to any known 

 species ; but is perhaps more nearly allied to M. rafa Lea and 

 M. teres Lea in its elevated spire and convex whorls. It wants, 

 however, the smooth whorls of the former, its dark red color, 

 and elliptical aperture. From the latter it may be distinguished 

 by its striated whorls, its less slender proportions, the absence 

 of folds, its obscure bands, and white aperture. This species is 

 unusually interesting, from the fact that it is the first species in 

 Conchology known to have been procured from the subterra- 

 nean river flowinc; throus-h the Mammoth Cave. 



