= 
1917.} NATURAL SCIENCES OF PHILADELPHIA. 93 
Peak. Station 27, west of Animas ranger cabin, and Station 30, 
about 33 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. mogollonensis, 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 (Pl. VII, fig. 10). In the genitalia, the presence of a very 
short, broad penial retractor attached to the diaphragm distinguishes 
mendax (Pl. X, fig. 1) from mogollonensis (Pl. 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 17.8 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, Pl. X, fig. 3. 
OREOHELIX. 
Three of the four species belong to the southern group of species 
having swollen penes. The fourth, O. 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. 
Oreohelix swopei n.sp. Pl. IX, figs. 2, 3-3b. 
The shell resembles O. 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 23 flat whorls, shows growth- 
