64 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
The Tumacacort Mountains are west of the Santa Cruz River, 
and pass southward into the Pajaritos. Visited by J. H. F. and 
A. A. Hinkley in 1919. 
Sonorella hinkleyi tumacacori P. & F. Tumacdcori Peak and 
next mountain southward. 
Zonitoides minuscula alachuana (Dall). Station 205. 
Zonitoides singleyana (Pils.). 
Gastrocopta ashmuni (Sterki). Station 235. 
Gastrocopta dalliana (Sterki). Station 235, 236. 
Gastrocopia cristata (P. & V.). Station 205, Santa Cruz, River 
drift. 
Gastrocopta pellucida hordeacella (Pils.). Station 205, Santa 
Cruz River drift. 
Pasaritos Mountains.—These rolling hills extend across the 
Mexican boundary west of Nogales. Visited by J. H. F. and A. A. 
Hinkley early in 1919. It is the only known locality in Arizona for 
Bulimulus. 
Sonorella walkert montana P. & F. Stations 231, 232, 238. 
Sonorella sitiens P. & F. Numerous stations. 
Bulimulus nigromontanus Dall. Pina Blanca canyon, and 5 
miles north in the Tumacdcori Range. 
Gastrocopta dalliana (Sterki). Station 237. 
III. Norges anp Descriptions OF SONORELLA, OREOHELIX, 
BULIMULUS AND HOLOSPIRA. 
HELICIDAE 
The species of Sonorella may be grouped as follows: 
a'. Length of penis decidedly exceeding the diameter of the shell. 
b!. Penis-papilla long, thick-walled, perforated by a minute duct; 
epiphallus shorter than the penis. 
c'. Penis large, simply bent or but little folded in preserved 
examples, the stout papilla from about half to nearly as long 
as penis. Group of S. virilis. 
c?. Penis slender, both it and the vagina disposed in folds. 
Group of S. rinconensis. 
b?. Penis-papilla short (contained 414-5 times in penis), hollow, 
with an enclosed tube; epiphallus longer than penis. Group of 
S. dalli. 
a*. Length of the penis less than the diameter of the shell. 
bt. Penis-papilla usually stout and cylindric, or enlarging toward 
the blunt or conic distal end. 
cl. Vagina much longer than the penis. Group of S. granu- 
latissima. 
