1915.] NATURAL SCIENCES OF PHILADELPHIA. 399 
Alt. 12, diam. 19.6 mm.; umbilicus 2.8 mm.; 42 whorls. 
Santa Rita Mountains at Station 17 (Camperel Canyon), on the 
northeastern flank of Old Baldy. Type No. 112,165, A. N.S. P. 
We regret that the jar containing the soft parts of this species 
proved leaky, and its contents were lost. It seems to be related to 
S. granulatissima, as the sculpture is very similar. 
VY. SMALL RANGES AND HILLS OF THE SANTA CRuUz RIVER VALLEY. 
Between Tucson and Nogales and the Santa Rita and Baboquivari 
Mountains there are many buttes and ranges of hills or small moun- 
tains, a few of which we visited, finding in each a special species of 
Sonorelia and sometimes a few small shells. 
Among the more important ranges which should be investigated 
we may mention the Tumacacori (or Atascoso) range, an extensive 
mass of arid looking mountains, extending south to the Mexican 
line, and probably supporting little but Sonorella. They are easily 
accessible from the Sonora R. R., being about 6 miles from “Siding 
No. 4.” These mountains on the south pass into the Sierra de los 
Pajaritos, which lie west of Nogales—‘‘a confused mass of rocky 
crags, peaks, flat-topped mountains with vertical sides, enormous 
trachyte dykes, steep narrow ridges and deep canyons.” They are 
covered with “‘a fine growth of oak, juniper and manzanita, while 
magnificent walnut, sycamore and ash trees line the canyons.” 
Water supply precarious except in the wet seasons. These fine 
mountains are unknown to the conchologist. 
Various species reported from Tucson were certainly brought 
there from more or less distant localities. Sonorella granulatissima, 
reported by Bartsch, Smiths. Misc. Coll., Vol. 47, p. 193, and Ash- 
munella varicifera Ancey are Huachucan species. The following 
‘species were taken in the drift débris of the Santa Cruz River, near 
Tucson, chiefly above the bridge. The fresh-water shells are mainly 
fossils, washed out of, or exposed upon the low dirt banks, where 
the stream has cut down through a former cienega. Part of the land 
shells probably washed in from the Tumamoc and other eastern 
foothills of the Tucson Range. We found Bifidaria tuba and Thysan- 
ophora hornit on the Tumamoc Hills, and with other minutie, in 
.débris washed down from the hills at the hill terminus of Congress St. 
THYSANOPHORA HORNII (Gabb.). 
HOLosPIra FERRISSI SANCTZCRUCIS P. and F. (see p. 388). 
ZONITOIDES SINGLEYANA (Pils.). 
JSSUCCINEA AVARA Say. 
