150 



HELIX. 



Wants the superior plications of H. hemipleuris, and differs also 

 in being larger, with a more distinct umbilicus. 

 H. obstructa, Heude (not Fer.) is a synonym. 



Section VI, MESODON, Rafinesque, 1819. 

 Subsection I, MESODON (restricted). 



H. MAJOR, Binney. PI. 31, fig. 42. 



Imperforate, yellowish horn color, stout, covered by close oblique 

 strise, suture well-impressed; whorls 6, convex, body whorl very 

 slightly declining ; lip thick, wide, covering the umbilicus, with a 

 sub-toothlike elevation on the base. Diam. 44 mill. 



Tennessee to Georgia and Alabama; a mountain species. 



Coarser, larger, more globose than H. albolabris, yet perhaps only 

 a local variety of it. 



H. ANDREWSII, Binney. PI. 31, figs. 43-45. 



Imperforate, globose, delicately striate, with microscopic revolving 

 strise, horn color, whorls 6, convex, the last greatly swollen; peristome 

 white, thickened, slightly reflected, the extremities not approaching. 



Diam. 25 mill. 



Mountains of North Carolina and Georgia. 



A supposed variety of this species (fig. 45) is figured by Mr. 

 Binney, which I would refer to H. major, yet its dentition and 

 genitalia are said to be the same as in H. Andreivsii. As in 

 H. albolabris, it sometimes occurs with a parietal tooth. 



H. ALBOLABRIS, Say. PL 31, figs. 46-48. 



Imperforate, moderately thick, closely obliquely striate, with 

 crowded, slightly impressed spiral lines, yellowish horn color; 

 whorls 5-6, flattened convex, the body whorl a little deflected at 

 the aperture and contracted behind the lip ; lip white, widely reflec- 

 ted, dilated over the umbilicus. Diam. 25 mill. 



Canada to So. Carolina, westward to Arkansas and Nebraska. 



Var. DENTATA. 



Parietal wall with a slight denticle. This variety has the aperture 

 of H. thyroides, but may be distinguished by its imperforate axis. 



H. MULTILINEATA, Say. PI. 31, figs. 49-51. 



Imperforate, closely, obliquely striate, with deep suture, yellowish 

 horn color, with more or less numerous spiral chestnut bands of 



