EASTERN PROVINCE — INTERIOR REGION SPECIES. 313 



Mcsodoii WetS8Prl>yi, Bland. 



Shell with nmbilicus covered, orbicular depressed, thin, granulately 

 striate, pale horn-colored; epidermis dark, covered with no. 331.* 

 oblique, prostrate hairs ; spire soniewliat conoidal ; suture 

 impressed; apex obtuse; whorls 5, slightly convex, grad- 

 ually increasing, the last suddenly deflected, rather gib- 

 bous, constricted, beneath convex, subangulate at the 

 periphery ; aperture oblique, roundly lunate, with a white, 

 erect, oblique, tongued-shaped parietal tooth; peristome 

 thickened, angularly reflected, the upper margin expanded, n. Wethcrhyi. 

 the columellar margiu dilated, covering the umbilical perforation. 

 Greater diameter 17, lesser 15"^"^ ; altitude, 8""". 



HeMx Wetlierbyi, Blaxd, Ami. Lye. Nat. Hist. N. Y., x, 301 (1873). 

 Mesodon WetlHrlyi, W. G. Binnky, Terr. Moll., v, 330. 



At the base of sandstone cliffs, inoath of Laurel Eiver, Whitley 

 County, Kentucky; Campbell County, Tennessee; Eoan Mountain, 

 North Carolina. Probably a species of t lie Cumberland Subregion. 



This species belongs to the same group as flentifcrus, Biuney, and 

 Eoemeri, Pfeiffer, but is of smaller size, somewhat more elevated, and 

 readily distinguished from them by the sculpture and epidermis. It 

 differs from M. divestvs, Gould, 4n having a parietal tooth, and, although 

 in general appearance like a small foim of 71/. appressus. Say, is without 

 the lamina on the basal margin of the peristome. (Bland.) 



Jaw as usual in the genus; about 18 ribs. 



Lingual membrane (Terr. :\roll., V, Plate VIII, Fig. D) with 35-1-35 

 teeth ; 12 laterals. It will be seen in the figure that the marginal 

 teeth have a simple, not bifid, inner cutting point, a peculiarity shared 

 by only a few other species. 



Genitalia unobserved. 



Animal uniform slate-color. 



MesodoH thyroides, Say. 



Shell narrowly umbilicated, depressed globose; spire convex; epi- 

 dermis of a uniform yellowish-brown or russet color; whorls 5, with 

 fine parallel strife running obliquely across them ; spire more or less 

 elevated ; suture distinctly impressed ; aperture lunate, contracted by 

 the iieristome, the plane of the aperture making a considerable angle 

 with the plane of the base of the shell ; parietal wall with a prominent, 



* The hirsute character of the epidermis is not shown in the figure, 



