1910.] NATURAL SCIENCES OF PHILADELPHIA. 111 
Two examples, extremes of a continuous series, are figured to illus- 
trate this (fig. 23 c, d), from about the middle of the amphitheatre 
west of Reed’s Mountain. This variation is not peculiar to any special 
colonies, though greater in some lots than others. 
At the Cave Creek Falls there is a small form. Three specimens 
measure as follows: 
NEN 0 org Se ey, Mods abctapce ibaa: 8 7 6.7 mm 
een NA a aS ate ie eee: nce 16 16 (thes 
TOs i Ae a a Sa Noiep Fa ee | 54 53 54 
The genitalia of two individuals are figured. PI. X, fig. 4, is from 
one of the very large shells of the head of Cave Creek at about 8,000 
Fig. 23.—A. chiricahuana (Dall). A, B, Cave Creek Canyon; C, D, amphitheatre 
of Cave Creek. 
feet elevation, near Long Park, diam. 19.5 mm. ‘The ducts are very 
long in these large snails. Both penis and spermatheca adhere to 
the uterus throughout part of their length, the penis looping under the 
spermatheca. The vagina is stout down to its base. Pl. X, fig. 1, was 
drawn from one of the very small shells of the Cave Creek Falls, diam. 
13.5 to 16 mm. The ducts are shorter and the base of the vagina is 
thin-walled. The penial retractor is longer in this species than in 
the toothed species, but not so long as in the Huachucan Ashmunellas. 
The collar and foot are slate-colored ; mantle-lining of the last whorl 
cream-white, not maculate. 
