% 
4 
' 
’ 
‘a 
1910.] NATURAL SCIENCES OF PHILADELPHIA. $5 
merely a thin film on the penultimate whorl. Cuticle smooth and 
without “fringes” in young or old, very delicately striated spirally ; 
sculpture of the embryonic whorl delicate, usually worn off. 
Probably only the first of those measured is mature: 
Alt. 6.1, diam. 13.8 mm. 
ce 4, z3 iD ce 
(79 6, a4 ey cc 
(79 3, ar iT (a9 
(a9 D, ce ih ce 
Found at the Cave Creek Falls in broken rock sprayed by the falls, 
and near the water’s edge, in company with a very small form of 
SS SS 
SSSQwssss 
Fig. 
9.—Oreohelix clappi cataracta P. and F. 
Ashmunella chiricahuana. It was also found occasionally among 
the rocks higher up the slide with O. barbata and Ashmunella angulata. 
About 25 were found in two visits to the stations. None were alive, 
but some perfectly fresh. It is probably a deep burrower. This is the 
only station where O. barbata and O. clappi were found together. 
O. c. cataracta 1s quite a distinct race. The green, polished base 
reminds one of Omphalina. It is the smoothest and most depressed 
form of O. clappi. 
Oreohelix chiricahuana Pilsbry. Fig. 10. 
Proc. A. N.S. Phila., 1905, p. 283, pl. XI, figs. 1-3 (shell), pl. XIX, fig. 4 
(genitalia), pl. X XIII, fig. 24 (jaw). 
The range or this species extends from Emigrant Canyon to Lime- 
stone Mountain, a distance of about 50 miles. Its range is mark- 
edly discontinuous towards the north and south ends, but from White 
Tail to Cave Creek Canyons the colonies are not widely separated. 
It is always found on limestone, never where the country rock is meta- 
morphic or igneous. 
The several races differ as follows: 
