1917.] 



NATURAL SCIENCES OF PHILADELPHIA. 



45 



'Oreohelix tenuistriata Hend. and Dan. Fig. 3a. 



Topotypes dissected show that this is a species having genitalia 

 like haydeni and strigosa depressa. The length of penis is equal to 

 the diameter of the shell; the length of its internally ribbed lower 

 portion is contained 2| times in the total length. 



Length of penis, 



10 



mm.; of its internally ribbed portion 



4 mm. 

 Length of epiphallus, 2 mm. 



Length of retractor p., 6.5 mm. 



Length of vagina, 3 mm. 



Fig. 3. — a, Oreohelix tenuistriata. b, 0. peripherica, Morgan, Utah. 



The central and lateral teeth have sharp side cutting points, the 

 marginals with distinct cusps. There .are about 6 lateral teeth; but 

 the transition to marginals is very gradual. Jaw is striate, light 

 yellow. 



0. hemphilli and 0. carinifera, which approach tenuistriata in 

 characters of the shell, are unfortunately not known anatomically, 

 l)ut the forms nearest hemphilli have genitalia like 0. yavapai. 



Oreohelix hemphilli eurekensis Hend. and Dan. Fig. 4a. 



Topotypes dissected. It groups with 0. yavapai, having the 

 internally ribbed part of the penis more than half the total length, 

 the latter less than the diameter of the shell. We do not know the 

 genitalia of typical 0. hemphilli, but assuming that it is like eurekensis, 

 both should be transferred to the group containing 0. yavapai, 

 ■concentrata, metcalfei, pilsbryi and barbata. 



Length of penis, 4.4 mm. ; of ribbed portion 2.5 mm. 



Length of epiphallus, 2 mm. 

 Length of retractor p., 6 mm. 



