516 PROCEEDINGS OF THE ACADEMY OF [Nov., 
AMNICOLIDA. 
Paludestrina stearnsiana Pils. 
Ash Canyon, one bleached specimen; spring in Tanner Canyon, 
numerous living examples. 
PELECYPODA. 
Pisidium abditum huachucanum Pils. and Ferr. 
Stream in Carr Canyon (C. R. Biederman, type loc.) ; spring in Carr 
Canyon, 7,000 feet; springs in Tanner Canyon at 6,000 and 7,000 feet ; 
Spring at the mouth of Ash Canyon, 4,500 feet; artificial pond at the 
mouth of Hunter Canyon, 4,500 feet (L. E. Daniels, October, 1907), 
This is, we believe, the only Pisidiwm recorded from Arizona. 
EXPLANATION OF PuatEes XIX To XXI. 
Piate XIX .— Figs. 1, 2, 3—Sonorella dalli Bartsch. Tanner Canyon. 
Figs. 4, 5, 6—Sonorella granulatissima latior Pils. Cotypes. 
Figs. 7, 8—Sonorella granulatissima Pils. Cotypes. 
Fig. 9—Sonoreila granulatissima Pils. Miller Canyon. 
Figs. 10, 11, 12—Sonorella granulatissima parva Pils. Cotypes. 
Figs. 13, 14, 15—Sonorella danielsi Pils. and Ferr. Cotypes. 
Fig. 16—Sonorella huachucana Pils. Bear Canyon. 
Fig. 17—Sonorella hwachucana Pils. Type. 
Fig. 18—Sonorella danielsi P. and F., brown variety. Ash Canyon, No. 
94,385. 
Pirate XX.—Fig. 1—Ashmunella levettei ursina Pils. and Ferr. No. 94,351. 
Fig. 2—Ashmunella l. angigyra Pils. No. 83,269. 
Fig. 3—Ashmunella varicijera Anc. No. 94,341. 
Fig. 4—Ashmunella levettei ursina P. and F. No. 94,349. Atrium and ends 
of penis and vagina protruding. 
Fig. 5—Ashmunella varicifera Anc. Spermatheca of another individual. 
Fig. 6—Ashmunella varicifera Anc. Penis opened. 
Fig. 7—Ashmunella microdonta Pilsbry and Ferriss. No. 94,347. One of 
the cotypes. 
Pirate XX1.—Fig. 1—Sonorella granulatissima Pils. No. 83,257. Cotype. 
Fig. 2—Ditto. Penis opened to show papilla. 
Fig. 3—Ditto. Penis, epiphallus and flagellum. 
Fig. 4—Ditto. No. 94,336. Miller Canyon. 
Fig. 5—Sonorella danielsi Pilsbry and Ferriss. No. 94,337. 
Fig. 6—Sonorella danielsi Pilsbry and Ferriss. No. 94,318. Type. 
Fig. 7—Sonorella g. latior Pils. No. 94,387. Tanner Canyon. 
Puate XXII.—Figs. 1, 2, 3—Sonorella rinconensis Pils. and Ferr. Central, 
lateral and marginal teeth. 
Fig 4—Sonorella rinconensis. Type, genitalia. X 2. 
Fig. 5—Sonorella dalli Bartsch. No. 94,384, genitalia. X 2. 
Fig. 6—Sonorella dalli Bartsch. Jaw. 
