106 Descriptions of New Fluviatile Shells. 



rioribus planis, utrinque angulatis, ultimo subconvexo, indistincte bi- 

 angulato ; suturis valde impressis ; apertura elongato-ovata, intus albida, 

 columella incurva, in sinum tonuem producta. 



Shell conical, nearly smooth, rather thick, light horn-colored ; 

 spire elevated, but not acutely so ; whorls 8-9, flat ; lines of 

 growth distinct, having almost the appearance of ribs ; two 

 lines, distant, slightly visible, surround each whorl, and from 

 these the whorls incline towards each other to form a broad 

 groove between them ; sutures well impressed ; aperture small, 

 narrow ovate, within whitish ; columella much indented and 

 curved, forming a slight sinus at base. 



Length 0.88 inch (23 millim.). Diam. 0.80 inch (8 millim.). 



Length of aperture 0.33 inch (8 millim.). 



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



Habila t. — Al abama. 



My cab. Cab. Lye. Nat. Hist., 3ST. Y. B. W. Budd, M.D. 



Obs. — A fine symmetrical shell, some of its varieties ap- 

 proaching Jl. sordida Lea in form, but differing in every other 

 respect. The whorls enlarge regularly, and the lower raised 

 line on the whorls being consequently more prominent, the 

 spire has somewhat an imbricated appearance, giving rise to its 

 specific name. The specimens before me, twelve in number, 

 are all decollate. 



The upper whorls are often rather prominently ribbed, and 

 the concentric lines thereby rendered crenulous. 



2G. McSaaiia png'odiformis. 



Plate III. Fig. G. 



T. conica, tenui, fusca ; spir& obtuse elevata ; anlV. 7-8, carina ele- 

 vate, acuta, suprd suturam cinctis, ultimo carinis duabus instructo; sutu- 

 ris valde impressis; apertura ovata, infra subangulata, intus albida; 

 columella incurva, in sinum tenuem angustum producta. 



