338 PROCEEDINGS OF THE ACADEMY OF [May, 



Length 17.9, diam. 3.9 mm.; whorls 17 



Station 4, on the south slope of Daniels Mt. near the summit. 

 Types Nos. 112,269, A. N. S. P., collected by Pilsbry and Daniels, 

 August 22, 1910. 



Out of 20 shells opened, 16 have three lamellae and 4 have two, 

 the axial and basal. The pillar-like shape, numerous whorls, and 

 prevalence of a superior lamella, as well as the deeper position of the 

 lamellae, are individually variable characters, yet in the aggregate 

 they may suffice to define a race in this group. 



These Holospiras live among rocks where there is very little 

 xerophytic vegetation and the heat is terrific. The type lot was 

 picked up at about the same elevation as Station 5, but there the 

 exposure is less calorific, the sparse pinons and the cliffs afford 

 shade, so that the soil retains some moisture, 



Holospiras were seen scattered over a large area below and around 

 Station 4. 



Holospira bilamellata heliophila n. subsp. Plate VII, figs, 3 to 3c. 



The shell is small, rather slender, with a long cone; strongly costate 

 throughout; usually having axial and basal lamellae within the middle 

 part of the penultimate whorl. Peristome well expanded in the 

 basal and columellar margins, iDut scarcely so near the upper angle. 



(1) One lamella, the axial. 3 specimens = 15%. 



Length 14.2, diam. 3.8 mm.; whorls 16 

 " 13.3, '' 3.7 " " 15i 



" 13 " 3.9 " " 14i 



(2) Two lamellae, axial and basal. 13 specimens = 65%. 

 Length 14.8, diam. 4 mm.; whorls 15| 



