1917.] NATURAL SCIENCES OF PHILADELPHIA. 93 



Peak. Station 27, west of Animas ranger cabin, and Station 30, 

 about 3| miles west, down the mountain. Station 49, Black Canyon, 

 above Diamond Bar ranch house, on the western slope of the 

 range. Station 32, garden of Stephen Reay, west end of Kingston. 

 Type locality, Station 16. 



The shell, while superficially very like A. mogoUoiiensis, is easily 

 distinguished by the somewhat granose intermediate whorls and 

 far less deeply engraved last whorl. In A. mogollonensis there is no 

 granulation, and the last whorl is very deeply and closely engraved 

 spirally (PI. VII, fig. 10). In the genitalia, the presence of a very 

 short, broad penial retractor attached to the diaphragm distinguishes 

 mendax (PI. X, fig. 1) from mogollonensis (PI. X, fig. 3), in which 

 there is none. 



This snail has a remarkable range. The lowest colonies on both 

 sides are far below the forest, especially on the west side, where it 

 was found in great numbers in the arid Gallina Canyon. The 

 examples here are rather small, diam. 16 to 17.3 mm. On the east 

 side we took it under wood and rubbish in a garden of Kingston, 

 where it was common. Most of the other localities are along the 

 crest of the range, in the humid forest zone. The type locality is 

 on the south side of Iron Creek some distance above the mouth of 

 Spring Creek, at the entrance of a ravine from the south, where 

 there has been rather extensive mine prospecting. 



A figure of the genitalia of A. mogollonensis P. & F. is given for 

 comparison, PI. X, fig. 3. 



OREOHELIX. 



Three of the four species belong to the southern group of species 

 having swollen penes. The fourth, 0. cooperi, is here at the southern 

 border of its vast range. 



Most of the specimens taken between the middle of August and 

 the middle of October contained embryos. A few collected in the 

 latter part of October contained none. 

 Oreolielix swopei n. sp. PI. IX, figs. 2, 3-36. 



The shell resembles 0. strigosa depressa. It has an ample umbilicus, 

 a low, conic spire, obtuse and rounded at the summit, and a slightly 

 angular periphery. Color fawn or vinaceous fawn, with two choco- 

 late or lighter bands in the usual positions, and finely, irregularly 

 speckled and streaked with creamy markings, partly the result of 

 wear. The surface is glossy where unworn, marked with irregular 

 growth-lines and fine wrinkles, which form sharp little folds just 

 above the suture on some of the intermediate whorls. No spiral 

 striation. The embryonic shell, of 2| flat whorls, shows growth- 



