191(3.1 



NATURAL SCIENCES OF PHILADELPHIA. 



351 



further than the others. In the Black Range form the ribbed portion 

 projects upwards into the cavity of the papillose part. 



Measurements in mm., of the genitalia of Oreohelix cooperi. 



Locality. 



Glenevre, Colo., 



7,000 ft, S2.1S5 



McCammon, Idaho, 



Station 1 



Eureka, Utah, Station 



6... 

 O. cooperi maxima. 



Yellowstone Park, 



96,973 



Black Range, X. M. 



Sta. 26 



MS 



r - 

 i. - 



«- 







2.4 

 5.3 



4 



10 

 9 



2 



3.7 



3.7 



5 

 5 



11 i 16-18 

 21 22 



15-16 



24 26 



Fig. 3 

 Fig. 2 

 Fig. 4 



Fig. 1 



Oreohelix yavapai extremitatis Pils. & Ferr. PI. 22, figs. 6, 6a. 



The specimen figured is from Shell, Wyoming (Pilsbry, Nautilus 

 XXVII, 1913, p. 50). The penis is short, its lower two-thirds 

 swollen, upper third cylindric; internally there are very low, short 

 folds bounded above by a low narrow transverse ridge, in the enlarged 

 part, the upper part having densely papillose walls. Fig. 6a repre- 

 sents the penis opened and pinned flat. The papilla? in the upper 

 portion are represented diagrammatically. The epiphallus is not 

 quite half as long as the penis. The base of the spermatheca duct 

 is enlarged, as usual. The uterus contained 8 embryos in the indi- 

 vidual figured, the largest of 2^ whorls. Length of penis 7 mm., 

 of its internally costate part 4.5; epiphallus 3.3 mm.; vagina 2 mm.; 

 spermatheca and duct 13 mm. 



The central and 5 or 6 inner lateral teeth have no side cusps. The 

 seventh lateral has a well developed ectocone. 



The jaw is striate as usual in the genus. 



The animal is purplish black above and on the sides, the sole 

 cream colored. 



The embryonic shell has 2\ whorls, is convex above with an angular, 

 not acute, periphery. The first \\ whorls are convex with irregular 

 growth stria?, some microscopic spirals then appearing. The last 

 third of a whorl has about 5 coarse but very low spirals, and the 



