1910.] 



NATURAL SCIENCES OF PHILADELPHIA. 



97 



e.— Whorls fully 6; lip narrow, convex, not forming a 



projecting angle above A. p. fissidens. 



e 1 . — Whorls 5^; lip wide, angulated above; young forming 



a very heavy lip-rib A. p. albicauda. 



c 1 . — Three lip teeth separated by nearly equal spaces. 



d. — Corneous or light brown; whorls of the spire convex; 

 outer basal tooth not greatly compressed. 

 e. — Corneous; basal teeth subequal and well separated. 



A. proximo.. 

 e 1 . — Basal teeth somewhat united, the inner often reduced, 

 young shells having a very heavy lip-rib. 



A. p. emigrans. 



d 1 . — Shell dark brown; whorls of the spire flattened; outer 



basal tooth strongly compressed, entering. A. angulata. 



The genitalia are very similar in all Chiricahuan species examined — 

 so similar that we omit detailed descriptions and merely add here a 

 table of measurements in mm. of the organs in examples of the several 

 species. 



Species and locality. 



A. ferrissi: 



Cave Creek, 94,515. 



A. angulata: 



Cave Creek, 87,020. 



A. lepiderma: 



White Tail Canyon. 



A. duplicidens: 

 Morse Canyon. 



A. fissidens emigrans: 

 99,604 



A. fissidens albicauda: 

 White Tail 



A. chiricahuana 



Head of Cave 



Cave Creek Falls. 





A . esuritor: 



Barfoot Park, 94,432. 



Topotype, 92,205. 



4.5 

 4 



5 

 5 



4.5 



6 

 6 

 5 



9 

 5.5 



7 

 8 

 8 

 5 





25 

 31 



25 

 27 

 23.5 



39 

 32 

 29 



70 

 33 



51 

 40 

 42 

 34 



53 j 



eg 



> XJl 



4 

 4 

 6 



4.5 



6.5 



6 

 7 

 6.5 



4 



19.5 



27 



17 

 21 

 23.5 



18 



3.5 24 



24 



58 

 33 



35 

 42 



42 



c / 



12 



11 



12 



11.5 



11 



13.2 



13 



12 



19.5 

 15 



15-16.5 



15 



o g 



5 .-a 



ttc 

 — a 

 ft, M 



pl.X.f. 7 

 pl.X.f. 6 



pl.X.f. 8 

 pi. X, f. 9 



pi. X,f. 4 

 pi. X,f. 1 



pi. X,f. 2 



pi. X,f. 5 

 pi. X.f. 3 



