NATURAL SCIENCES OF PHILADELPHIA. 57 



Obs A very neat, pretty species, with no very decided character to distin- 

 guish it from allied species. May be compared with M. brevispira, nob., but is 

 far more solid in its texture, of a darker color, and its surface is more polished 

 and shining ; much less slender too than brevispira, and that species is never so 

 abruptly decollate. It appears to be an abundant species. 



M. glauca, Anthony. Shell conical, folded, of a green color on the lower 

 whorls, often modified by a brown tinge on the upper ones ; whorls 10, slightly 

 convex, with prominent longitudinal ribs, obsolete on the body- whorl; sutures 

 well defined, but not deeply marked ; aperture ovate, livid within and with 

 occasionally a faint rosy tinge there; columella angulated at the middle; sinus 

 well defined. 



Hab. Tennessee. My Cabinet. 



Obs. A stout species, with prominent, curved ribs on all the upper whorls, 

 those on the body-whorl being less clearly defined or else absolutely wanting. 

 Color a beautiful apple-green, relieved by a broad yellow band near the suture ; 

 and this color often passes into a yellowish brown on the upper whorls. Near 

 the apex the folds are often traversed by four or five prominent striae, which 

 pass over without being interrupted by the longitudinal ribs. May be com- 

 pared with M. viridula, nob., as to color, but is less slender, and the ribs at 

 once distinguish it. 



M. infrafasciata, Anthony. Shell conical, smooth, solid, of a pale brown 

 color, form moderately slender and elevated; whorls 8-9, decollate, slightly 

 concave; sutures distinct; lines of growth curved and very distinct ; body- 

 whorl decidedly concave, with a well-marked ridge revolving near the summit 

 of the aperture, so as to make a tolerably sharp angle near the middle of the 

 body-whorl ; two or three coarse striae revolve parallel with it ; below this is a 

 dark brown band, continued around the base of the shell ; aperture rhombic- 

 ovate, livid and banded within ; columella strongly incurved, with a callous 

 deposit its whole leDgth and well-defined sinus at base. 



Eab. Tennessee. 



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

 Smithsonian Collection. 



Obs. Compared with M. gradata, nob., it is more elongate, more solid, and 

 has not the carina and regularly graded whorls so characteristic of that species. 

 Less conical than M. canaliculata Say, and less broad. Like M. annulifera, 

 Con., in form, but has not the revolving costae of that species. 



M. padcicosta, Anthony. Shell conical, nearly smooth, of a dark greenish 

 horn color ; spire obtusely elevated ; whorls nearly flat, with a few distinct 

 longitudinal ribs on the upper ones ; body- whorl entirely smooth ; sutures well 

 marked; aperture ovate, within livid or purple; columella rounded; sinus 

 small. 



Hab. Tennessee. 



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

 N. Y. ; Smithsonian Collection. 



Obs. Belongs to a group of which nitens may be considered the type. 

 From that species it differs, however, by its more robust form and stronger 

 ribs. There is also a marked peculiarity in this species not often observed in 

 the genus; the spire being acute at the apex, increases regularly for the first 

 four or five turns, and then suddenly expanding, becomes as it were distorted 

 in appearance. The ribs are distant from each other and very strongly 

 expressed, differing in this respect from M. alhleta, which it otherwise resembles. 

 It is a beautiful and appears to be an abundant species. 



M. occulta, Anthony. Shell conic, smooth, rather thin ; color lemon-yellow, 

 inclining to brown, with a darker brown band on each whorl, increasing to two 

 on the body-whorl ; whorls 7-8, rather convex ; suture deeply impressed ; aper- 

 ture ovate, within dusky white, with the outer bands seen faintly through its 



I860.] 



