88 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
cinnamon and pinkish-buff, the base paler, a chestnut-brown 
band above the periphery. The surface is slightly glossy. Em- 
bryonic whorls radially crinkled, the second with very irregular 
tangential (protractive) threads on its peripheral half; subsequent 
whorls with weak lines of growth only. The spire is low, whorls 
convex, the last wide, descending a little in front. The aperture 
is rounded, peristome slightly expanded. 
Alt. 8, diam. 15.7 mm.; 43 whorls. Type, station 2434. Alt. 
10, diam. 17 mm. Station 243. 
The penis is rather long with a basal sheath nearly a third of its 
length; the papilla cylindric with conic end and weak spiral pli- 
cation. Epiphallus about as long as penis, the long penial retractor 
inserted upon it. No flagellum. The vagina is longer than the 
penis, and at the distal third there is an annular swelling, the wall 
there being thickened and muscular, with an internal annular ridge. 
Above this the internal wall has fine, irregular, longitudinal threads. 
Measurements of the organs in mm. follow. 
Weiser Woe eee 2 As Ae en et ree 43735 43726 
GIES Src oe SE Ne a eee 10.5 mm. 10 mm. 
Bemieapyellst hie. hi petbaneel aussie Geis 4 * 2 
ipiphialltis se ©... acer toes at eset hs a PS ES ee 
RV SRP IRIEY 5 Peete! oe oath hee hae i Jp tone one Tee fa 2™ INE Sune’ 
SLRS 41 C0. | eee ee aegis, GRO ian emf 243 244 
A small, depressed nearly smooth species. At Station 244, in a 
porphyry slide on a small knob, southern side of the southern peak 
of the Cayetanos, most of the specimens taken are albinos, the shell 
white throughout. There were 452 albinos to 24 banded specimens 
(Plate III, fig. 4). 
Sonorella hinkleyi cayetanensis Pils. & Ferr. Plate III, fig. 5. 
Sonorella cayetanensis P. & F., Nautilus vol. 33, July 1919, p. 19. 
Cayetano Mountains: Station 216, in a slide of white porphyry 
on north side of double peak, near the top, type loc. Also Stations 
207, 212, 215, 217, from the foothills up. 
The shell is thin, light, umbilicus contained about 8 times in the 
diameter, dilute cinnamon, fading to whitish around the umbilicus 
and on both sides of the chestnut-brown supraperipheral band. 
The latter shows only narrowly on the penult whorl. Surface 
glossy, lightly striate. Faint traces of protractive and retractive 
threads are visible on the latter part of the embryonic shell in 
young examples. The whorls increase rather slowly to the last, 
which is about double the width of the penult and descends very 
little in front. The thin peristome is narrowly expanded, inser- 
tions of the margins rather widely apart. Height 11.7, diam. 21 
mm.; nearly 43 whorls. 
