152 HELIX. 



region excavated ; aperture obliquely lunate, with a parietal tooth ;. 

 reddish horn colored, the lip often rosaceous. Diam. 14 mill. 



Mts. in Western N. Carolina, and Georgia. 



This, and H. Columbiana of the Pacific region are the only hirsute 

 species of Mesodon. 



H. DENTIFERA, Binney. PI. 32, figs. 70-72. 



Depressed, spire flatly convex, base well-rounded; whorls 5, 

 delicately striate, suture distinct, but not deeply impressed ; aperture 

 wide, lip broadly reflected and covering the umbilicus, parietal wall 

 armed with a prominent tooth ; yellowish horn color. 



Diam. 19 mill. 

 Maine to North Carolina, westward to Ohio; a mountain species. 



H. WETHERBYI, Bland. PL 32, figs. 73, 74. 



Imperforate, thin, granulately striate, pale horn-color, hirsute; 

 whorls 5, the last suddenly deflected, periphery subangulate ; parietal 

 wall with a linguiform tooth, peristome dilated over the umbilicus. 



Diam. 17 mill. 



Kentucky, Tennessee, N. Carolina; a mountain species, 



H. KOMERI, Pfr. PI. 32, fig. 75. 



Depressed, rather thin, semitransparent, closely, faintly striate, 

 suture slightly impressed, horn colored ; whorls 5, somewhat convex, 

 the last obtusely angulated on the periphery, scarcely descending in 

 front; aperture obliquely lunate, lip thickened, hardly expanded 

 above, w T ell-reflected below, partially (or rarely, entirely) closing 

 the umbilicus, parietal wall generally with a well-developed tooth. 



Diam. 21 mill. 



H. DIVESTA, Gould. PI. 32, figs. 76, 77. 



Moderately thick, coarsely obliquely striated, suture well marked; 

 whorls 6, the last with subangulate periphery; base convex, umbilical 

 region excavated but covered; aperture lunate, very oblique, lip 

 white, broadly reflected, horizontal at base, its outer portion flexuous; 

 dingy horn color. Diam. 18 mill. 



Washington Springs, Arkansas; Mississippi. 



First described by Gould as H. abjecta, a name preoccupied by 

 Lowe. 



H. THYROIDES, Say. PL 32, figs. 97-99, 78-80. 



Thin, regularly, closely, obliquely striate, suture moderate ; whorls 

 5, convex, the last large, well-rounded, slightly declining at the aper- 



