400 PROCEEDINGS OF THE ACADEMY OF [June, 
PUPOIDES MARGINATA (Say). 
BIFIDARIA PROCERA CRISTATA P. and V. 
5 PELLUCIDA HORDEACELLA (Pils.). 
TUBA P. and F. 
VERTIGO OVATA Say. 
LYMNA PARVA Lea. 
= OBRUSSA Say. 
BULIMOIDES COCKERELLI P. and F. 
PLANORBIS TENUIS Phil. 
. CARIB&HUS Orb. 
PARVUS Say. 
ARIZONENSIS P. and F. 
Puysa virGaTa Gld. 
PALUDESTRINA PROTEA (Gld.). 
PISIDIUM PAUPERCULUM (Sterki).® 
3 COMPRESSUM Prime (KIRKLANDI Sterki). 
ANODONTA DEJECTA Lewis, fossil and recent, fragmentary. 
iz 
ce 
as 
e 
In the drift débris of the Santa Cruz River at Amado’s Ranch 
(not far from the mouth of Sopori Creek) we took the following: 
ZONITOIDES SINGLEYANA (Pils.). 
ne MINUSCULA (Binn.). 
\PUPOIDES MARGINATA (Say). 
BIFIDARIA PELLUCIDA HORDEACELLA (Pils.). 
pe PERVERSA Sterki. 
PROCERA CRISTATA P. and VY. (one specimen). 
PENTODON (Say). 
VERTIGO OVATA Say. 
VALLONIA PERSPECTIVA Say. 
Puysa HUMEROSA Gld. 
“t  -“NIRGATN ‘Gld: 
73 
a3 
On Sopori Creek, five miles west of Amado’s Ranch. 
THYSANOPHORA HORNII (Gabb). 
PUPOIDES MARGINATA (Say). 
PHYSA sp. undet. 
Sonorella arizonensis (Dall). 
Epiphragmophora arizonensis Dall, Proc. U.S. Nat. Mus., XVIII, p. 1, 1895. 
Sonorella arizonensis (Dall), Bartsch, Smiths. Mise. Coll., XLVII, p. 198, 
Pl. 33, fig. 6. 
This is a rather globose species with narrow umbilicus, quite — 
unlike anything we found. The type is a bleached specimen found ~ 
in the Santa Cruz River at Tucson, which no doubt drifted down — 
from above. As no Sonorella lives at or near the river level, it must — 
have been washed down from some mountain or rocky hill in the 
8 The species of Pisidiwm in these lists were determined by Mr. E. G. Vanatta. 
