154 BULLETIN OF THE 



Triodopsis Levettei, BLAND, (p. 314.) 



Plate I. Fig. E. 



Shell umbilicate, orbiculate-convex, thin, shining, translucent, slightly and 

 irregularly obliquely striated, chestnut-colored, the upper whorls paler ; spire 

 scarcely elevated, apex obtuse ; suture impressed ; whorls 7, rather convex, 

 gradually increasing ; the last somewhat depressed at the aperture, obsolete!}' 

 spirally striated, constricted behind the aperture, and slightly scrobiculated, 

 base subconvex ; umbilicus moderate, ^ diameter of the shell, pervious ; 

 aperture very oblique, subcircular, with a well-developed flexuose, transverse 

 white tooth on the parietal wall ; peristome reflected, pale chestnut-colored, 

 thickened within, the margins joined by a slight callus, the right margin with 

 a white, obtuse, erect, submarginal tooth, the basal margin with two white 

 transverse teeth, the upper one the larger. 



Triodopsis Levettei, BLAND, Ann. N. Y. Acad. Sci., Vol. II. No. 4, p. 116, Fig. 

 (1880). 



Near Santa Fe, New Mexico, where two living and one dead specimen were 

 collected by my friend, Dr. G. M. Levette, who presented to me one of the 

 former. Cabinet of Dr. Levette, and the Binney and Bland collection in the 

 American Museum of Natural History, New York. 



This species is quite distinct from any known North American or other 

 form. The number of whorls, and of teeth, their form and color, with the 

 color of the shell and peristome, are its peculiar features. The striae are by no 

 means so well developed as shown in the figures. (Bland.) 



The figures are copied on my plate. 



Von Martens suggests that the species may be a Polygyra. 



Mesodon. (p. 314.) 



* 



All the specific names should have the masculine termination. 

 Mesodon Andrews!, W. G. BINN. (p. 324.) 



Plate II. Fig. t. Plate III. Fig. E, F. 



Shell imperf orate, globose, very thin, with delicate wrinkles of growth and 

 microscopic revolving striae ; horn-color ; spire elevated, conic, apex obtuse ; 

 whorls six, convex, the last greatly swollen ; peristome white, thickened, 

 slightly reflected, ends separated, the columellar one expanded. Greater diam- 

 eter, 25 mm. ; lesser, 20 mm. ; height, 14 mm. 



Mesodon Andrews!, W. G. BINN., Ann. N. Y. Acad. Sci., Vol. I. p. 360, PL XIV. 

 Fig. E, F, PL XV. (1879). 



Roan Mountain, Mitchell Co., North Carolina. Mrs. G. Andrews. The 



