1910.] NATURAL SCIENCES OF PHILADELPHIA. 69' 



one-third the length of the penis. Epiphallus not very unlike the 

 penis in length. Flagellum as usual in the genus. The vagina is 

 short. Spermatheca oval, on a long duct. Two specimens of No. 

 97,414 measure: 



Length of penis 8 



" epiphallus 9 



" papilla 3 



" flagellum 1 



" " vagina 6 



" " spermatheca and duct 22 



The jaw has five ribs. The pericardium is about half as long as the 

 kidney. 



In its soft anatomy, this species resembles S. bowiensis Pils. and 

 also S. rowelli (Newc), but differs from the latter by having a dis- 

 tinct flagellum. The shell is more like S. rowelli, but differs from both 

 species by its more inflated contour and very large aperture. In 

 conchological characters the species is, for a Sonorella, very distinct, 

 and unlike other known Chiricahuan snails. 



The smallest specimen seen measures, alt. 8, diam. 13.5 mm. This 

 species is named in memory of William G. Binney. 



Group of Sonorella virilis. 



These forms are distinguished from all other Helices known to us 

 by the enormous length of the penis and its papilla, Sonorella rincon- 

 ensis, which has an equally long penis, but a comparatively short 

 papilla, is apparently the most nearly related species. All other known 

 Sonorellas have the penis short or of moderate length. All known 

 species of this group are Chiricahuan. The sculpture of the embryonic 

 shell resembles that of the group of S. hachitana, but usually the 

 pattern is very indistinct, 



Sonorella virilis Pils. PL II, figs. 1-6. 



S. virilis Pils., Proc. A. N. S. Phila., 1905, p. 266, with var. circumstriata, 

 p. 267. 



This species was described from a single shell which so far as we can 

 learn was probably taken in Rucker Canyon. The variety circum- 

 striatawas described from the talus at the foot of Reed's Mountain, 

 about a half mile below Reed's place, Station 11 in Cave Creek. The 

 series now available shows that this variety is scarcely distinct enough 



