554 - PROCEEDINGS OF THE ACADEMY OF [DeC, 



Alt. 15.5, diam. 23.5 mm. 



Alt. 15.5, diam. 23 mm. 



Alt. 15.5, diam. 21.5 mm. 



Types No. 91,329, A. N. S. P., from Sugar Loaf Mt., Choctaw Nation, 

 I. T., collected by Pilsbry and Ferriss, April 6 and 7, 1903. 



While readily distinguishable from typical P. zaleta (or exoleta, as it 

 is commonly known), this form has much in common with the race of 

 northern Alabama, such as Mr. H. E. Sargent found at Woodville. In 

 Woodville shells also the parietal tooth is very large, and the size is 

 ordinarily that of typical zaleta, though occasional dwarf specimens 

 are not larger than the Ozark race. 



In fresh specimens of P. z. ozarkensis there is usually an appearance 

 of angulation at the periphery in front, though no actual angle exists. 

 The more elevated specimens might easily be mistaken for P. elevata, 

 which however differs by its columellar plate, the irregular shape of 

 the aperture and the more closely wound whorls. 



Typical P. zaleta we have seen from Black Hawk Hollow, Fort Madi- 

 son, Lee Co., Iowa (T. Van Hyning), but it has no extensive distribu- 

 tion in Iowa. Binney reports it from Missouri, but all the specimens 

 before us from that State are the variety ozarkensis. 



Binney specified no type locality for his Helix zaleta, merely stating 

 that it is " common in the States bordering on the Ohio river, and in 

 the western parts of Virginia and Pennsylvania." In order to have 

 a definite standard, Cincinnati, O., may be considered type locality, 

 specimens from that place agreeing well with his description and 

 figures. 



The following localities are now known for P. z. ozarkensis. Where 

 no collector is mentioned the shells were taken by the authors : 



Missouri: CuiTent River; Seligman, Barry Co.; Cedargap, Wright 

 Co.; Springfield, Green Co. (S. Weller); Chadwick, Christian Co. 



Arkansas: Eureka Springs (Sampson); Mammoth Spring, Fulton 

 Co. ; Harrison, Boone Co. (Stuart Weller) ; Rogers, Benton Co. ; Maga- 

 zine Mt., Blue Mt. Station and Petit Jean Mts., Logan Co.; Mablevale, 

 Pulaski Co. (C. W. Johnson); Little Rock; Poteau Mts., south of 

 Gwynn P. 0., Hartford Station, Sebastian Co.; Rich Mt. and Mena, 

 Polk Co.; Little River, Little River Co. In addition to these places 

 from which we have seen specimens, Mr. Sampson records P. exoleta 

 from Washington Co. 



Indian Territory: Sugar Loaf Mt., close to the western boundary of 

 Sebastian Co., Ark.; Wyandotte. 



