1909.] NATURAL SCIENCES OF PHILADELPHIA. 501 
long, and bound to the vas deferens by the outer muscular fascia. 
As a rule, with rare exceptions, therefore, the flagellum is absent. 
Sonorella granulatissima latior Pils. Pl. XIX, figs. 4, 5, 6. 
Proc. A. N.S. P., 1905, p. 264, pl. 18, figs. 24-28. 
Usually a larger shell than S. granulatissima, the last whorl more 
depressed, approaching S. dalli in shape. Originally described from 
Brown’s Canyon, it is now known also from the south side of Limestone 
Mountain, east fork Salvation Ridge® and from Tanner Canyon. Three 
cotypes are figured. 
The genitalia have been examined in numerous examples from 
Tanner Canyon (pl. XXI, fig. 6), Brown’s Canyon, east fork of 
Salvation Ridge and Limestone Mountain. The characters are iden- 
tical with those of S. granulatissima. All of them have the upper 
part of the vagina swollen, and there is no flagellum. Measurements 
of several alcoholic specimens are given in the table. 
Fig. 2. Marginal teeth of S. g. latior, Tanner Canyon. 
The radula has 38, 1, 38 teeth, with 10 laterals. The outer marginal 
teeth have the inner cusp deeply bifid, the outer one sometimes split 
(fig. 2, No. 94,383, Tanner Canyon). 
Sonorella granulatissima parva Pils. Pl. XIX, figs. 10, 11,12. _ 
No further information on this small race from the northwestern 
end of the range has been received. S. mearnsi Bartsch, from 4 miles 
south of the international boundary, a few miles east of the San Pedro 
river, is another form which will probably prove to be closely allied 
to granulatissima and rowelli when the anatomy can be examined. 
Sonorella danielsi n. sp. Pl. XIX, figs. 13, 14, 15; pl. X XI, figs. 5, 7. 
S. granulatissima (in part), Prtspry, Proc. A. N.S. P., 1905, p. 263, pl. 18, 
figs.39,40,44;pl. 11, fig. 10 (Miller Cn.) ; also pl. 18, figs. 36, 37,38 (Ida Cn.). 
The shell is more depressed than granulatissima, yellow with a 
conspicuous dark band without pale borders, the early whorls flesh- 
colored; surface glossy, the granulation of the last whorl very weak, 
6 Salvation Ridge forms the divide between Brown and Tanner Canyons on the 
northeast side and what we supposed to be Salvation Camp Canyon on the south. 
We collected only on the ridge, which is shown on the map at the heads of 
Brown and Tanner Canyons. 
