58 PROCEEDINGS OF THE ACADEMY OF 



substance ; columella beautifully rounded ; outer lip produced, a small sinus at 

 base. 



Hab. Wisconsin. 



My Cab. ; Cab. H. Cuming, London; A. N. S. Philada. ; State Coll., Albany, 

 N. Y. ; Smithsonian Collection. 



Obs. A very beautiful and lively species. Bears some resemblance to M. 

 pulchella, nob., but is less elongate, more delicately colored, and of a less solid 

 texture ; the bands are often obsolete, and never so distinctly expressed as in 

 pulchella ; its spire is also more acute and the whorls more rounded. Com- 

 pared with M. brevispira, nob., which in form it resembles, it is more attenuate, 

 has a greater number of whorls, and its bands also distinguish it. Its delicate 

 yellow color also is not a common character in the genus, and forms a promi- 

 nent mark for determination. 



M. opaca, Anthony. Shell ovate, thick, smooth, of a dark brown color ; spire 

 short, composed of about six convex whorls; body-whorl large, subangulated 

 in the centre ; sutures indicated by a narrow lighter line, and very distinct ; 

 aperture ovate, livid within ; columella indented and tinged with purple ; outer 

 lip a little curved ; sinus not remarkable. 



Hab. Alabama. My Cabinet. 



Obs. A dusky inconspicuous shell of no great beauty. Only two specimens 

 have ever come under my notice, but I am persuaded, nevertheless, that they 

 are distinct cannot well be compared with any other species. More smooth 

 than M. athleta, nob., and devoid of ribs, which that species has. Its dark, 

 dirty, brown color down to about the middle of the body-whorl and pale olive- 

 green underneath, together with its purple columella, may sufficiently distin- 

 guish it. 



M. pulchereima, Anthony. Shell conical, carinate, elevated, acute ; whorls 

 6-8, flat, upper ones obscurely ribbed longitudinally ; body whorl sharply angu- 

 lated, with a dark brown band directly upon the carina, and 2 or 3 below it, 

 one of which is very near the carina. Upper whorls with 2 bands each, widely 

 separated; sutures distinct, rendered more so by the neighboring carina; aper- 

 ture ovate, within 3 or 4 banded ; columella rounded and indented, sinus small. 



Hab. North Carolina. 



My Cabinet, Cabinet H. Cuming, London ; Acad. Nat. Sci. Phila. ; State 

 Collection Albany, New York ; Smithsonian Collection. 



Obs. A small but remarkably beautiful species ; its bright yellow ground and 

 conspicuous dark lines give, by contrast, a lively and pleasant character to the 

 shell. Compared with M. nigrocincta, nob., it is a larger species, its colors 

 are more decided, and its carina are also a prominent mark of difference. M. 

 clara nob. is a larger and more globose species, its bands are broader and it has 

 no carina. It seems to be an abundant species, varying occasionally in some 

 of its characters, but always easily recognized. More than 100 specimens are 

 before me. 



M. tenebrocincta, Anthony. Shell conic-ovate, smooth, rather thick ; spire 

 rather obtusely elevated; whorls 6-7, nearly flat, but with an obtuse carina be- 

 low the middle of each, and one more decided between that and the suture ; 

 suture well marked and with a pale band near it ; lines of growth decided ; 

 aperture linear-ovate, within dusky and having 2 dark bands there, sinus very 

 decided. 



Hab. Tennessee. 



My Cabinet, Cabinet H. Cuming, London; Acad. Nat. Sci. Phila.; State 

 Collection, Albany, New York ; Smithsonian Collection. 



Obs. Compared with M. valida nob. it is smaller, less robust, more slender, and 

 may also be distinguished from that plain species by its more lirely exterior the 

 dark brown band or bands, contrast finely with the general color of the shell, 

 and with a light band near the sutures. 



[Feb. 



