1910.] NATURAL SCIENCES OF PHILADELPHIA. 145 
EXPLANATION OF Puates I-XIV. 
Figures 35 and 36 B were drawn by Helen Winchester; the other figures were 
drawn or photographed by H. A. Pilsbry. 
‘Puate I—Figs. 1, 2,3—Sonorella bicipitis n.sp. Types from Station 1, Buckeye 
Canyon, No. 94, 328 Ay NeS: P: 
Figs. 4 a 4,5—S. bicipitis, Nine-mile Water Hole. Nos. 94,324 and 89,908 A. 
ING DE . 
Figs. 6, 7, 8, 9—Sonorella optata n. sp. Types from head of Big Emigrant 
Canyon. No. 94,319 A. N: S. P. 
Fig. 10—S. optata—Cleft i in summit between forks of Big Emigrant Canyon. 
No. 94,321 A. N.S. P. 
Figs. 11, 12, 18, 19—S. optata. West side of Big Emigrant Mountain. 
No. 94,320 A. N.S. P. 
Figs. 13, 14, 15, 16—Sonorella bowiensis Pils. Topotypes, from Quartzite 
Peak, near Fort Bowie. No. 94,327 A. N.S. P. 
Fig. 17—S. Cs aaa smallform. Head of Big Emigrant Canyon. No. 99,789 
WN Ss dre 
Puate II—Figs. 1, 2, 3—Sonorella virilis Pils. Cave Creek, Station 11 (topo- 
types of var. circumstriata). No. 94,332 A. N.S. P. 
Figs. 4, 5—S. virilis. Two miles up the south fork of Cave Creek. No. 
94,335 A. N.S. P. 
Fig. 6—S. virilis. Spring Branch near Rucker Camp, head of Rucker 
Canyon. No. 97,563 A. N.S. P. 
Figs. 7,8, 9—Sonorella virilis leucura n. subsp. White Tail Canyon, Station 
14. No. 99,682 A. N.S. P. 
Figs. 10, 11—Sonorella micra n. sp. Station 10, White Tail Canyon. No. 
94,334 A. N.S. P. 
Fig. 12—S. micra. Station 17, White Tail Canyon. No. 94,330 A. N.S. P. 
Figs. 13-18—Sonorella binneyi n. sp. Horseshoe Canyon. 
Pirate III—Fig. 1—Sonorella bicipitis Pils and Ferr. Genitalia of specimen 
from Buckeye Canyon. Station 3. x3. No. 94,326. 
Fig. 2—S: bicipitis. Genitalia of specimen from Nine-mile Water Hole. 
No. 94,324. xX 3. 
Fig. 3—Side of the head of same specimen. 
Fig. 4—S. bicipitis. Penis opened to show the papilla. Buckeye Canyon, 
Station 4. No. 94,325. 
Fig. 5—Sonorella binneyi Pils and Ferr. Genitalia of No. 97,414. Horse- 
shoe Canyon. 
Fig. 6—S. bicipitis. Sole of specimen from Nine-mile Water Hole. No. 
94,324 
Fig. 7—S. bicipitis. Genitalia of specimen from Buckeye Canyon, Station 
1. X 3. No. 94,328 (type lot). 
Prats IV—Fig. 1—Sonorella optata Pils and Ferr, Genitalia of No. 94,322. 
Big Emigrant Mountain, <X 3, with details of penis, papilla and the 
vestigeal flagellum (fl.). 
Fig. ay optata. West Side of Big Emigrant Canyon. No. 94,320: x 4. 
Fig. 3—S. optata. Big Emigrant Canyon, Station 1. No. 94,319. x 4. 
Fig. 4—S. optata. Cleft in Big Emigrant Canyon. No. 94,321. x 4. 
Fig. 5—S. optata. Genitilia of young snail. No. 94,323. X 14. Outline 
of penis papilla shown by broken line. 
Fig. 6—Sonorella bowiensis Pils. Genitalia of a topotype. X 3. No. 
94,327. 
Fig. 7—S.optata. Genitalia of a nearly mature snail. No. 94,323: x 4. 
Cross J. Mountain. 
Pirate V—Fig. 1—Sonorella micra Pils and Ferr. Genitalia. x 4. No. 
94,334. From Station 10, White Tail Canyon. The penis is extended, 
its papilla projecting. 
