516 PROCEEDINGS OF THE ACADEMY OF [Nov.,. 



AMNICOLID^. 

 Paludestrina stearnsiana Pils. 



Ash Canyon, one bleached specimen; spring in Tanner Canyon, 

 numerous living examples. 



PELEOYPODA. 

 Pisidium abditum huachucanum Pils. and Ferr. 



Stream in Carr Canyon (C. R. Biederman, type loc); spring in Can- 

 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 Pisidium recorded from Arizona. 



Explanation of Plates XIX to XXI. 



Plate 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 — Sonorella 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 huachueana Pils. Bear Canyon. 

 Fig. 17 — Sonorella huachueana Pils. Type. 



Fig. 18 — Sonorella danielsi P. and F., brown variety. Ash Canyon, Xo. 

 94,385. 



Plate XX. — Fig. 1 — Ashmunella levettei vrsina Pils. and Ferr. No. 94,351. 

 Fig. 2— Ashmunella I. angigyra Pils. No. 83,269. 

 Fig. 3 — Ashmunella varicifera 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. 



Plate XXL — 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. 



Plate XXII. — Figs. 1, 2, 3 — Sonorella rinconensis Pils. and Ferr. Central,, 

 lateral and marginal teeth. 

 Fig 4 — Sonorella rinconensis. Tvpe, genitalia. X 2. 

 Fig. 5— Sonorella dalli Bartsch. 'No. 94,384, genitalia. X 2. 

 Fig. S—Sonorella dalli Bartsch. Jaw. 



