182 



PROCEEDINGS OF THE ACADEMY OF 



[March, 



6,700 feet. Shells 14 to 15 mm. diameter, normal in shape and color, 

 similar to lot No. (10). This is farthest north for the species. . 



Oreohelix yavapai profundorum n. subsp. PI. XII, figs. 1-14. 



The shell is opaque-white with some brownish, corneous streaks and 

 often two fleshy, brown bands, the inner whorls more or less flesh- 

 tinted; solid; with sculpture of rather wide, irregular, subobsolete 

 growth-wrinkles, but no spiral strice. Whorls 4+ to 5, the last angular 

 or subangular in front, descending moderately or deeply to the apeiture, 

 often becoming shortly free. Aperture very oblique or subhorizontal, 

 the peristome slightly thickened and brownish, continuous and free 

 or in contact with the preceding whorl for a short distance. 



Adult shells measure from 13 to 17£ mm. diameter. 

 The genitalia are figured (fig. 4). The lower half of the penis is 



much swollen, the upper half slender and 

 cylindric, the retractor muscle inserted 

 at its apex. The short epiphallus is 

 rather stout. Vagina short and very 

 large. The uterus in the individual 

 figured contained four embryos ; the shells 

 4.7 mm. in diameter, with 2f whorls and 

 acutely carinate periphery. The podo- 

 cyst is larger on the upper embryos, but 

 present in all. 



Length of penis, 6.7 mm.; epiphallus, 

 3 mm. ; vagina, 4 mm. ; spermatheca and 

 duct, 17 mm. 



Out of 100 shells from the type locality, 

 taken at random, 56 per cent, resemble 

 figs. 1-3, 44 per cent, being like figs. 4, 5. 

 The race is therefore markedly senile. 

 Grand Canyon, in "Spectacle Cove," 

 Station A, the head of a recess in the cross-bed sandstone south of 

 where the Mystic Spring or Bass Trail zigzags down, in a talus resting 

 on the red sandstone forming the Le Conte Plateau. 



Fig. 4. — -Oreohelix yavapai pro- 

 fundorum. 



Elevation about 



