56 PROCEEDINGS OF THE ACADEMY OF 



Obs. A neat, pretty species, of rather plain appearance. Compared with M. 

 gracilior, nob., it is broader, shorter, and of darker color ; the broad deep cinc- 

 ture on the body-whorl and beautiful red bands in the interior, so conspicuous 

 in M. gracilior, are also wanting. From " atbleta" it differs by its shorter, more 

 acute form, and by the absence of folds. It is less slender than M. viridula. 



M. bicincta, Anthony. Shell conical, elevated, spire very acute ; whorls 7, 

 upper ones bicarinate, and body whorl encircled by three or four carinae, the 

 upper two of which are prominent, while the lower two are often striae merely ; 

 color dark olive brown, very shining, and relieved by a faint or yellow narrow 

 band near the suture; sutures distinct; aperture ovate, and brown within; 

 columella deeply indented. 



Hab. Tennessee. 



My Cabinet ; Cab. Hugh Cnming, London ; A. N. S. Philada. ; State Collection, 

 Albany, N. Y. ; Smithsonian Collection, Washington, D. C. 



Obs. A beautifully distinct and well marked species of that group which M. 

 bella, Conrad, may be considered most fitly to represent. May be distinguished 

 from M. bella by its broader and more acute form, more distinct carination and 

 absence of the beaded line so characteristic of that species. Lines of growth 

 conspicuous and crowded. Differs from M. bicostata, nob., by its less robust 

 form, darker color, and by the form of its spire, which diminishes more rapidly 

 towards the apex. 



M. abscida, Anthony. Shell ovate, smooth, olivaceous, thick ; spire obtuse, 

 composed of five low whorls nearly flat ; body whorl large, occupying nearly 

 the entire length of the shell ; aperture not broad but long, subrhombic, more 

 than half the length of the shell; columella deeply rounded and indented, 

 outer lip much curved and produced ; sinus broad and conspicuous. 



Hab. Alabama. My Cabinet. 



Obs. A ponderous species, whose chief characteristic is its square form and 

 short truncate spire, resembling in that respect M. planospira, nob. It differs 

 from that species, however, by its more elongate form, narrow, rhombic aper- 

 ture, and by having several revolving striae at base. It is a solid shell of com- 

 pact texture, and seems to be rare, as only two specimens have come under my 

 notice. 



M. bicostata, Anthony. Shell conical, light horn color, rather thick; spire 

 elevated, acute; whorls 11-12, strongly carinate near the apex, and decidedly 

 80 on each succeeding whorl, not excepting even the body-whorl in most cases, 

 though sometimes obsolete there; carinae often in pairs, near to, and parallel 

 with each other; sutures deeply impressed, often with a decided furrow at that 

 point, caused by the carinae. Aperture broadly elliptical, or subrhombic ; 

 within dirty white or obscurely banded ; columella deeply rounded, with a well- 

 marked sinus at base. 



Hab. Tennessee, near Athens. 



My Cabinet; Cab. Hugh Cuming, London; Cab. A. N. S. Philada.; State 

 Collection, Albany, N. Y. ; Smithsonian Collection, Washington, D. C. 



Obs. Appears to be a very abundant and rather variable species. Several 

 hundred individuals have come under my notice. It cannot well be confounded 

 with any other species, though of a form by no means uncommon. The sharp 

 double carina will at once generally determine it. Occurs abundantly near 

 Athens, in small streams. 



M. fdnebralis, Anthony. Shell conic, smooth, solid, of a dark chesnut 

 color; spire elevated and generally abruptly truncate; whorls from 3 to 5 only 

 remaining, slightly eonvex ; aperture ovate, within bluish; columella white, 

 tinged occasionally with purple; sinus small. 



Hab. Tennessee. 



My Cabinet; Cab. Hugh Cuming, London; A. N. S. Philada.; State Coll., 

 Albany, N. Y. ; Smithsonian Collection. 



[Feb. 



