72 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
Sonorella xanthenes n. sp. Piate I, fig. 13; plate VII, fig. 11. 
Kitts Peak, near the top, Station 123, at foot of cliffs near the 
head of stream, under scattered rocks among sticks and leaves in 
oak brush. Type no. 118094 A.N.S.P. collected by J. H. Ferriss, 
1918. Paratypes in coll. Ferriss. 
The shell is rather thin, has a moderately raised spire and 
rather small umbilicus contained about 83 times in the diameter; it is 
dull cinnamon-buff, paler on the base, with a narrow chestnut-brown 
band above the periphery. Surface smooth except for light growth 
lines, having little gloss. The last whorl descends moderately in 
front. The peristome is thin, narrowly expanded, dilated at the 
columellar insertion and impinging slightly on the umbilicus. Pari- 
etal callus very thin. 
Height 8.4, diam. 13. mm.; 43 whorls. Type. 
ona) TAG Ee ees “largest. 
To, 8 AS minh smallest. 
The penis contains a relatively long, smooth, slightly tapering 
papilla, acute at the end. The epiphallus is very slender, much 
longer than the penis, is a little swollen near the end and bears no 
flagellum. The penial retractor inserts on the epiphallus some 
distance from the penis. The vagina is decidedly shorter than the 
penis. 
Length of penis ..... 4.7 mm. Length of epiphallus 8 mm. 
ia z3 papilla 3 73 cc cc vagina 2 (a3 
This is one of the smallest species of Sonorella, about the size 
of the smallest specimens of S. coloradoensis. It differs from the 
latter in the slender, acute penis-papilla and long epiphallus, among 
other characters. 
Group of Sonorella ambigua. 
This group comprises a number of minor sections or series, such 
as (1) the series of S. binneyi, in which the last whorl is very wide, 
with S. binneyi, S. bowiensis, S. tryoniana, S. baboquivariensts; and 
(2) the series of forms with spirally grooved penis-papilla, com- 
prising S. twmamocensis, S. eremita, S. hinkleyi and S. hesterna. 
Sonorella ambiguaP.&I*. Plate 2, figs. 1-4; plate V, figs. 1-10, 12;plate VI, figs. 1-5. 
Sonorella ashmuni ambigua P. & F., Proc. A. N.S. Phila., 1915, p. 411. 
Abundant in the Cababi Hills, Stations 137-141, 148-146 (1918). 
Station 148, north side of the eastern hill of the group, is the type 
locality, being Cole’s original station. 
The large series does not show much variation, all being between 
20.5 and 24 mm. in diameter. It is a handsome, glossy form, light 
