296 



PROCEEDINGS OF THE ACADEMY OF [NoV.-DeC.^ 



Mus. No. Penis. Papilla. 



109,078 

 109,077 

 119,039 

 119.040 

 109,074 

 109,083 

 109,0S4 

 109,0S0 

 109,071 



12.5 

 12 

 9 

 10 



7.3 



S 

 6 



Retrac- 

 tor. 



Vagina. 



10 



S 11 

 12 , 8.5 



....! 9.5 

 .... 9 



7 



11 5.5 



.... 7 

 G 



Station. ' Fig. 



26 



26 

 4(1911). 

 3(1911). 



2'2 



38 

 Cave 



Cxi. 

 Cw. 

 Cy}. 



6/. 

 Qh'c. 



This species is closely related to S. hachitana (Dall) and ;S. compar 

 Pils. It has the peristome more thickened within than the former 

 and differs from S. compar^ by the more solid shell, more thickened 

 peristome, etc. 



The more widely open umbilicus distinguishes it readily from other 

 Sonorellas of the hachitana group found in the Santa Catalinas. 

 Other specimens of the original lot from the type locality measure : 

 Alt. 15 diam. 26.3 mm. Alt. 13.8, diam. 24 mm. 

 " 15.3 " 24.6 " " " " 23 " 

 " 13 " 23.6 " " 12.5, " 22 ". 

 The largest examples were taken at Station 3, two measuring: 

 Alt. 16.4, diam. 28.2 mm.; 5 whorls. 

 u j7 a 28 " 5 " 



Marble Peak and Apache Camp have oak, juniper and sycamore 

 wood on the lower slopes; the crest of the ridge, the head of the 

 main "slide," is in the pine belt. 



Sonorella marmorarius limifontis n. subsp. PI. Ill, figs. 5, 5a, 56. 



The shell is depressed, openly umbilicate (the width of umbilicus 

 contained 7 times in that of the shell) ; whitish, faintly buff near the 

 suture and on the spire, having the usual chestnut-brown band. 

 Last whorl wide, very deeply descending in front. Surface glossy, 

 weakly marked with growth-lines as in related species of the hachi- 

 tana group, and showing weak traces of impressed spiral lines on the 

 upper surface of the last whorl. The last whorl descends deeply 

 and abruptly in front. The aperture is very oblique, rounded-oval. 

 Peristome somewhat expanded, slightly thickened within. 



' SonorcUa conii^m', new name for Sonorella ashmuni Pils., Proc. A. N. S. 

 Phila. 1905, p. 259, pi. 17, figs. 9-14. Not S. ashmuni Bartsch. 



On comparison with the type cf S. ashmuni, this species is seen to differ coi:- 

 spicuously by the more depressed and more openly umbilicate .shell. — H..A.P. 



