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. PI. XIX, figs. 4, 5, 6. 

 Proc. A. N. S. P., 1905, p. 264, pi. 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 6 and from Tanner Canyon. Three 

 cotypes are figured. 



The genitalia have been examined in numerous examples from 

 Tanner Canyon (pi. 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 parya Pils. PI. 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. ap. PI. XIX, figs. 13, 14, 15; pi. XXI, figs. 5, 7. 



S. granulatissima (in part), Pilsbry, Proc. A. N. S. P., 1905, p. 263, pi. 18, 

 figs. 39, 40, 44 ;pl. 11, fig. 10 (Miller Cn.); also pi. 18, figs. 36,37,38 (IdaCn.). 



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. 



