1905.] NATURAL SCIENCES OF PHILADELPHIA. 281 



upper part is densely papillose inside. The epiphallus bears the penis- 

 retractor muscle, some distance from its base, and the vas deferens 

 enters centrally at the end. The duct of the spermatheca is some- 

 what swollen basally. The uterus contained neither eggs nor 

 embryos, the specimens having been collected in February. 



The radula (PL XXII, fig. 6) has 23.1.23 teeth. The mesocones are 

 long, and all the teeth have well-developed cdocones. The marginal teeth 

 are bicuspid as usual, the cusps unsplit. 



Oreohelix yavapai n. sp. PI. XXV, fig. 53. 



Shell thin, whitish more or less stained with brown, with a faint brown 

 band above and another close below^ the periphery. The small periph- 

 eral keel extends to the aperture, but is pinched up less than in neo- 

 mexicana; the last whorl elsewhere is well rounded, the earlier whorls 

 flattened. Embryo of 2^ whorls, the first nearly smooth, convex, the 

 next more flattened, finely, densely striate obliquelj^ and very strongly 

 striate and ribbed spirally. At the end of the embryonic stage this spiral 

 scidpture abruptly stops , and is succeeded by sharp oblique striation which 

 becomes cut by a few spiral lines. On the last whorl there are more 

 spirals, usually emphasized as series of granules or pits upon the oblique 

 striae (indicating cuticular processes in perfectly fresh shells). Wliorls 

 about 5J, the last hardly descending in front. The umbilicus is ample, 

 as in 0. y. neomexicana. Aperture oblique, rounded, with thin lip. 



Alt. 8.7 9.5 mm. 



Diam. 15.2 16.6 " 



Purtyman's ranch, on Oak creek, Yavapai county, about 40 miles 

 from Jerome, Arizona (northwest of the center of the Territory), types 

 No. 79,415, A. N. S. P., collected by E. H. Ashmun. Also found on 

 the svimmit of Mt. Mingus, near Jerome, and fossil in a road cutting 

 in Walnut Gulch, near Jerome (Ashmun). 



Dr. R. E. C. Stearns reported a form probably identical with 0. 

 yavapai from Coon Mountain, a curious crater about 10 miles south of 

 Canyon Diablo, and about 3 days' travel from Flagstaff, Arizona 

 (Patula strigosa Old., Nautilus, VI, May, 1892, p. 1; Proc. U. S. Nat. 

 Mus., XVI, p. 745). 



The embryonic young shells, 2 mm. diameter with 2-^- whorls, are 

 acutely carinatc (PI. XI, fig. 13). 



This species differs from 0. strigosa in the form of the shell, which is 

 more like 0. hemphilli, and by the diminutive penis, while the epi- 

 phallus is longer in proportion than in forms of strigosa I have exam- 



