1905.] NATURAL SCIENCES OF PHILADELPHIA. 2;^7 



Several lots collected by Mr. Ferriss in the Chiricahua Mountains 

 resemble S. virilis in size, color and sculpture, but differ in having about 

 one-fourth of a whorl more (4f), and a noticeably smaller aperture. 

 The spiral lines, while visible in some places on all of them, in a favor- 

 able light, are often excessively weak. None of them, unfortunately, 

 were sent in the flesh. 



In Bar (or Bearfoot) Park, at the summit of the Chiricahuas, the 

 specimens taken show some very weak spiral lines below the last suture. 



Alt. 10.7 10.7 mm. 



Diam. 18.9 18.7 " 



In Sawmill Canyon, Chiricahuas, adjacent to Bearfoot Park, similar 

 shells, diam. 18.7 to 19.9 mm., were taken (PI. XVII, figs. 17, 18, 

 19,20). 



Sonorella virilis circumstriata n. subsp. PL XVIII, figs. 48-50. 



In Cave Creek Canyon, Chiricahuas, the shells are darker throughout, 

 reddish-brown, with a broad very dark chestnut band with wide pale 

 borders, sometimes not very conspicuous. The last whorl shows weak 

 but distinct spiral engraved lines above the periphery, in addition to 

 the usual fine growth-strise. The umbilicus varies from about 3.3 to 

 3.8 mm. in width. A. N. S. P., No. 87,026. 



Alt. 11.6 11.3 11 10.8 mm. 



Diam. 21 20.3 20 19.5 '' 



Alt. apert. 9.7 9.2 9 8.9 " 



Diam. apert. 10.7 10.4 10 9.5 " 



The genitalia (PI. XX, fig. 19) in two specimens dissected agree in 

 having several minor differences from typical S. virilis. The penis, 

 while still extraordinarily large, is only about two-thirds as long as in 

 virilis. The vagina is a fourth longer. The epiphallus is the same as 

 in virilis. 



This form may prove to be connected with typical virilis by 

 intermediate stages, in which case the subspecies may prove super- 

 fluous; but at present the dark color, more distinct spiral striae, and 

 small aperture of the shell, and the somewhat differently proportioned 

 genitalia, seem worth recording. 

 Sonorella virilis huachucana n. subsp. PI. XVII, fig. 24. 



Shell slightly more elevated than S. hachitana, with much smaller 

 umbilicus; more elevated than >S. virilis, which also is more widely 

 umbilicate; glossy, thin, striate but without granulation. The top 

 of the last whorl, near the aperture, shows numerous weak spiral incised 



