44 PROCEEDINGS OF THE ACADEMY OF [Feb., 



figured in genitalia. Length of penis 27 mm., of internally ribbed 

 part 11, of epiphallus 7 mm. The distal part has a trilobed section. 

 Oreohelix cooperi (W. G. B.). 



Specimens dissected from four localities give the following measure- 

 ments of the male organs: 



Sta. 68, Sta. 69, Sta. 83, 



near near Sta. 73, near 



Montpelier, Montpelier, Paris, Garden City, 



Idaho. Idaho. Idaho. Utah. 



Length of penis 12.3 11 17 12 mm. 



L. internally ribbed part 



of penis 6.5 6.3 10 7 " 



L. epiphallus 4.6 6 6 4 " 



L. retractor penis 14 10 " 



Diam. of shell (approxi- 

 mate) 19 14 25 17 " 



As noted in a previous paper, this species is constantly distinguish- 

 able from 0. peripherica and the several forms of strigosa and haydeni 

 by having the internally ribbed part of the penis longer than the 

 papillose part; but 0. rugosa has the same proportions of the penis, 

 and can be distinguished from 0. cooperi only by shell characters, 

 which are not very definite. 

 Oreohelix hendersoni dakani Henderson. Fig. 2. 



Specimens from the type locality, Newcastle, Colo., were dissected. 

 The genitalia are similar to hendersoni, and unlike 0. rugosa, which 



Fig. 2. — Oreohelix hendersoni dakani, genitaUa. 



resembles 0. cooperi closely in soft anatomy. The distal part of the 

 penis of dakani has a trilobed transverse section. 



Length of penis, 21 mm.; of ribbed lower part 7.3 mm. 



Length of epiphallus, 6.3 mm. 

 Length of retractor p., 14 mm. 

 Length of vagina, 6 mm. 



