1910.] NATURAL SCIENCES OF PHILADELPHIA. 97 
e.—Whorls fully 6; lip narrow, convex, not forming a 
projecting angle above................00.... A. p. fissidens. 
e'.—Whorls 53; lip wide, angulated above; young forming 
avery heavy lp aily..c3 5 ..2..cdteeeciceese. A. p. albicauda, 
c'.—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. proxima. 
e'.—Basal teeth somewhat united, the inner often reduced. 
young shells having a very heavy lip-rib. 
A. p. emigrans. 
d‘'.—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. 
a ty ~ 
, 3 = : a 25 0.8 
Species and locality. a a = aS ae ea 
Mires metas eel) ogee ET 
Ay ie > oes Aas  & 
A. jferrissi: 
Wave @reel< 945115. ...........05 A525 4 19.5 12 | 0) Ma, a 07 
A. angulata: | 
Waveoreel'S7.020.............2 } 31 Ae lee cn eel pl. X, f. 6 
A. lepiderma: 
White Tail Canyon................ 5 25 4 7; 12 
et « Se Uh ei ie ee 5 27 4 21 1s) 
a < an ig 2 eae 4.5 | 23.5 6 23.5 ial 
A. duplicidens: | 
Morse Canyon. ...5s jcc...) 6 39 4 =i) 48 #352) |, ple eet, 8 
A, fissidens emigrans: 
OR Ate we etna tee fese seat cnt sawn dees 6 32 3.5 | 24 13 Ble XA E79 
A, fissidens albicauda: | 
WMG wad ses21 2.8 sles ciesccks nogeets 5 29 4.5 | 24 12 
A. chiricahuana | 
Plea@a OL, OAVE:...2.-260-ecsevescseess 9 70 6.5 58 19)75).| pl. X, f..4 
Cave Creek Falls.................... 5.5 | 33 8 | 33 15 pl. X,f.1 
| 
A. esuritor: | 
Barfoot Park, 94,432............ 7 51 GY 4 -S5 15-16.5| pl. X,f. 2 
“ ; “cc Li Peta AN 8 40 i 42 “ec 
e vc ify Gents 8 42 6.5 | 42 3 ple 5 
Topotype, 92,205...) 5 34 4 me 15 pl. X,4. 3 
