HELIX. 155 



This shell was formerly considered by Mr. Binney a small variety 

 of Arionta Townsendiana, but he now places it in Mesodon. The 

 .surface has not the revolving striae and malleatious of the Ariontse. 



Subsection II. ULOSTOMA, Albers. 1850. 



H. PROFUNDA, Say. PL 33, figs. 3, 4. 



Whorls 5-6, convex, strongly obliquely striate, with well-impressed 

 suture; aperture subcircular, lip large, white, its extremities con- 

 verging, with an obtuse tubercular tooth on the basal edge ; base 

 convex, umbilicus large, profound ; light horn colpr, usually broadly 

 banded with chestnut above, with numerous narroAV bands on the 

 base, sometimes without bands. Diam. 28 mill. 



Middle and Western United States, west of the Appalachian Mts., 

 South to Mississippi. 



H. Richardi, Fer. is a synonym: H. bulbina, Desh., is probably a 

 juvenile. 



H. SAYI, Binney. PL 33, figs. 6-8, 5. 



Orbicularly depressed, whorls 5-6, thin, regularly obliquely 

 striate ; aperture suborbicular, lip white, narrowly reflected, tuber- 

 cularly dentate on the base, parietal wall toothed; umbilicus 

 moderate, deep ; pale horn color, without bands. 



Diam. 22 mill. 



A Northern Species, inhabiting Mountains and elevated districts, 

 Maine to Illinois, southward to Pennsylvania. 

 It is H. diodonta, Say, not Muhlf. 



Yar. CHILHOWEENSIS, Lewis. PL 33, fig. 5. 



Shell much larger, with smaller or more rudimentary teeth, lip 

 more widely reflected on the base. Diam. 1*4 inches. 



Mts. of N. Carolina, and E. Tennessee. 



***. 



H. USAMBARICA, Craven. PL 32, figs. 100-2. 



Umbilicated, closely, flexuously lirate, brown above, lighter colored 

 below, glossy ; whorls 6, the last not descending ; lip thickened and 

 slightly reflected, aperture pale purplish white. Diam. 1 in. 



Usambara Country, Eastern Africa. 



Geographically widely sundered from this group ; of which it can 

 scarcelv be a member. The author writes that it "has more the 



