336 NEW MELANIDiE OF THE UNITED STATES. 



ture rather large, rhomboidal, pale reddish within; outer lip acute, scarcely sinuous ; 

 columella bent in, somewhat thickened. 



Operculum ovate, dark-brown, with the polar point near the base on the left. 

 Proc. Acad. Nat. Sci., 1862, p. 271. 



Eab. — Tennessee, Prof. T roost. 



My cabinet and cabinets of Prof. Troost and Dr. Hartman. 

 Diain. -29, Length -71 inch. 



Remarks. — These specimens sent to me long since by the late Prof. Troost are 

 nearly all truncate. I formerly considered them a variety of Melania (Goniobasis) 

 proxim.ee, Say, but it is a larger species, more exserted, and has a peculiar appearance 

 in the whorls of the spire assimilating to a coiled rope. Several young specimens are 

 perfect to the apex, which shows that all are more or less carinate, but very obtusely 

 so. The decollate specimens have no appearance of a carina on the lower whorls. All 

 the specimens were covered with the black oxide of iron, which being removed, the 

 epidermis is found to be smooth, polished, and bright reddish-brown. Usually the 

 upper part of the whorl is slightly impressed, which gives to the curve of the whorl 

 a peculiar form. The columella is usually light-brown, and some specimens have a 

 whiteness about the middle portion. The aperture is about two-sevenths the length 

 of the shell. 



Goniobasis Bentoniensis. PI. 38, fig. 198. 



Testa carinata, plicata, striata, conoidea, subtenui, virido-cornea, evittata ; spirfi. elevata, conoideH ; su- 

 turis valde inipressis ; anfractibus septenis, convexiuseulis ; apertura parviuscula, ovato-rhoinboidea, 

 intiis albida ; labro acuto, vix sinuoso ; columella incurva, parum contorts,. 



Shell carinate, folded, striate, conical, greenish horn-color, without bands ; spire 

 raised, conical; sutures very much impressed; whorls seven, slightly convex ; aper- 

 ture rather small, ovately rhomboidal, whitish within ; outer lip acute, scarcely sin- 

 uous ; columella bent in, somewhat twisted. 

 Proc. Acad. Nat. Sci., 1862, p. 271. 

 Hab. — Benton County ? North Alabama, G. Hallenbeck. 

 My cabinet and cabinet of Mr. Hallenbeck. 

 Diam. - 39, Length "93 inch. 



Remarlcs. — There are two specimens before me sent by Mr. Hallenbeck. He is not 

 positively certain that they were found in Benton County. Both these have revolving 

 . striae over all the whorls. The upper whorls have folds, which, where they cut the 

 strioe, are raised into obtuse nodes. The larger striae on the body whorl are represented 

 on the inside by white lines. It is rare that any species is carinate, plicate and striate 

 at the same time. It is allied to Melania ( Goniobasis) Boyldniana (nobis), but is not 

 tuberculate, nor is it so large. The aperture is about one-third the length of the shell. 



