1917.] NATURAL SCIENCES OF PHILADELPHIA. 89 
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| | 
Ashmunella tetrodon fragilis n. subsp. Pl. VI, figs. 1-1. 
The shell is markedly thinner than A. tetrodon, and subangular 
peripherally, the periphery situated high. Basal teeth small and 
well separated. Parietal tooth smaller than in A. te’‘rodon. There 
is no denticle between its inner end and the upper termination of 
the lip. 
Alt. 6.5, diam. 14 mm.; 54 whorls. No. 115,753, A. N.S. P. 
One colony was found, Station 58, in slides on south side of Cave 
Creek, near its mouth, and an equal distance from where the wagon 
road starts up a long-grade hillside on the trail from Chloride to 
Hillsboro, in the eastern foothills of the Black Range. 
Ashmunella tetrodon animorum n. subsp. PI. VII, figs. 2-20. 
The shell resembles A. tetrodon, but differs by having the basal 
teeth much closer together and united by a callus. The parietal 
_tooth is simple; the outer lip-tooth is long. Color light buff, with a 
slightly brownish tinge above. Under a strong lens some imperfect 
granulation is produced by the interruptign and irregularity of the 
growth striz on the penult whorl. There is also an extremely minute 
spiral striation on the later whorls. 
Alt. 7, diam. 15 mm.; 5} whorls (type, No. 115,747). 
Pea 2°". (Station 36): 
Black Range, from Station 26, Holden’s Spring (type loe.), north- 
