518 PROCEEDINGS OF THE ACADEMY OF [Nov., 
muscle is inserted distally on the lung-floor, as usual. The vagina is 
excessively long, longer than the penis, and of about equal diameter 
throughout (slightly over 1 mm.). The spermathees is globular, its 
duct much shorter than the vagina. The organs of an individual 
drowned and dissected fresh measure as follows: 
Length of penisy 6 os. Oe ae ee 
ee ee 012)! a a REMMI Ge tT oy 
Fri REE SINR Os Ba ANIA AMA one oc Ge outta gn 
ce A epipballign ute ON Sue Oho da eaa ee ioe ae 
Fe) SET Gian oe aa gains 6 Me oa 27 key | 
ae ““ vagina, bs Avi pencrati sh. A Se Fe 
i ke spermatheca and duct, Sh erty te RMR EE i" 
The liver is maroon colored when fresh. 
Types No. 94,313 A. N.S. P., from Rincon Peak, Rincon Mountains, 
Cochise County, Arizona; cotypes in coll. Ferriss. Specimens were 
also taken on Mt. Mica and Wrong Mountain, Rincon range. 
The jaw (pl. XXII, fig. 7) has six or seven strong ribs, projecting 
on both margins. 
The radula has 26, 15, 1, 15, 26 teeth (pl. XXII, figs. 1, 2,3). The 
central and lateral teeth are unicuspid, the cusps stout and obtuse, 
longer than the basal plates. At about the sixteenth tooth an ectocone 
appears. Towards the outer edge of the radula the inner cusp becomes 
bifid; and in many but not all of the outermost six or eight marginals 
the ectocone is split into two or three denticles (fig. 3). 
Conchologically this form stands very close to S. ashmwni Bartsch, 
from Richinbar, south of Prescott, Arizona; also found at Jerome, and 
at. Purtyman’s ranch on Oak Creek, 40 miles from Jerome. It would 
probably be scarcely possible to separate the two species by the shells 
alone. The genitalia, however, are widely diverse. S. ashmuni 
(Oak Creek) has genitalia of the type found in hachitana-like Sonorel- 
las of the Peloncillo, Florida and Dos Cabezas ranges, while S. rinconen- 
sis has the penis and vagina excessively lengthened. While quite 
unlike any known form, it seems nearer to S. virilzs than to other species 
which have been disseeted, but differs from that by its far shorter 
penis-papilla and by the vagina, which is much longer than the penis, 
while in S. virilis the penis is longer. 
Puate XXII.—Figs. 1, 2, 3—Sonorella rinconensis Pils. and Ferr. Central 
lateral and marginal teeth. 
Fig. 4—Sonorella rinconensis. ‘Type, genitalia. X 2. 
Fig. 5—Sonorella dalli Bartsch. No. 94,384, genitalia. x2 
Fig. 6—Sonorella dalli Bartsch. Jaw. 
Fig. 7—Sonorella rinconensis. Jaw. 
Fig. 8—Sonorella dalli. Teeth. 
