90 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
it a local race. The localities of species and race are separated by 
the Santa Cruz river valley. 
The shell varies in size. Height 9, diam. 17 mm., 43 whorls. 
Station 210. Height 11, diam. 18.5 mm.,°43 whorls. Station 
2043. 
The long penis has a sheath about one-third its length. The 
papilla is weakly spirally plicate, cylindric with long conic end. 
There is an extremely short flagellum. The penial retractor is 
very short, inserted near the base of the epiphallus. The vagina 
is much longer than the penis, and has a strong muscular annular 
swelling near its upper end, where it is folded upon itself. 
PGNI6.ccu Siren so 1 LA 13. 11.8 
Penis-papilla......... ee es 4.2 5. 4.2 
Eipiphallis cea: sites. Ey eee 11.5 iy 11.5 
Piel potent aacete es « minute minute minute minute 
Wao ont Pas) age ia Re 1G: pana? > CLT x 14 
Spermatheca and duct.21 “ 
ING cree toe sae 43731 43738 43732 43739 
Sonorella hesterna P. & F. Plate VIII, figs. 8, 9. 
Northern end of the Santa Rita Mountains: Station 49 (1917), 
near Rosemont; 50, west side saddle of Santa Ritas, overlooking 
Helvetia; 51, Helvetia; 52, Greaterville; all in the eastern part of 
Pima County. 
We provisionally refer a series of specimens from the northern 
and eastern Santa Ritas to this species from the southern foothills 
of the Rincons, which was described without anatomical char- 
acterization. 
It is very closely related to S. hinkleyi and particularly to S. h. 
cayetanensis, the genitalia being of the same general character, but 
the shell is more solid. The penis-papilla is strongly plicate spir- 
ally, with a conic end. There is a muscular swelling or node on the 
vagina. Flagellum minute, vestigial. The organs measure in 
length: 
Beis. hse een 13.0 mm. Varina. sate eee 17 mm. 
Penis-papilla....... ot Museum Nom see 118058. 
Epiphathis.. 3. ....0% Lb" * Dtation S Poke secteres 50. 
It remains to be seen whether S. hesterna from the type locality 
has the same anatomical features; it may possibly prove to be more 
like hachitana or walkert. 
Sonorella tumamocensis Pils. & Ferr. Plate VII, fig. 14. 
Tucson Range, Stations 86, Cat Mountain, 87, 90, Limekiln 
camp. Silver Bell mining camp (north of the Roskruge Range). 
