1917.] 



NATURAL SCIENCES OF PHILADELPHIA. 



89 



Ashmunella tetrodon fragilis n. subsp. PI. VII, figs. 1-16. 



The shell is markedly thinner than .4. tetrodon, and subangular 

 peripherally, the periphery situated high. Basal teeth small and 

 well separated. Parietal tooth .smaller than in A. tetrodon. There 

 is no denticle between its inner end and the upper termination of 

 the lip. 



Alt. 6.5, diam. 14 mm.; 5| 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. 2-26. ' 



The shell resembles A. tetrodon, but differs by having the Ijasal 

 teeth much closer together and united b}- 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 interruption and irregularity of the 

 gro^^i:h striae on the penult whorl. There is also an extremely minute 

 spiral striation on the later whorls. 



Alt. 7, diam. 15 mm.; oj whorls (type, No. 115,717). 

 " 5.4. •• 12 " (Station .36). 



Black Range, from Station 26, Holden's Spring (type loc), north- 



