1915.] NATURAL SCIENCES OF PHILADELPHIA. 387 



Type No. 112,236, A. N. S. P., collected by Pilsbry and Daniels, 

 August 29, 1910. 



The Escabrosa Ridge, or mountain side on the left, ascending 

 the first left-hand ravine above Bisbee on the Tombstone Road, is 

 the home of this Holospira. Extensive burning of the brush has 

 narrowed their range and decreased their numbers, at least for the 

 time, so that the series collected was not large.^ Some very small 

 scrub oaks remain in places; there are three species of agave, some 

 sotol and bear-grass, a few cylindropuntias, and many herbaceous 

 plants, now after the summer rains gay with flowers; over everything 

 a little scarlet morning-glory, which we afterward found common 

 in the ranges westward. 



Out of 20 shells opened, 18 have the axial lamella only; one has 

 also a small superior or parietal, and one has superior and basal 

 lamellse, both very low and small. 



This is a larger and longer species than H. ferrissi, and further 

 distinguished by the smooth later whorls and deficient internal 

 lamellse. The Chiricahuan H. arizonensis Stearns differs chiefly 

 by having the internal lamellse larger. 

 Holospira ferrissi fossor n. subsp. PI. XV, figs. 6 to 66. 



The short, cylindric shell is ribbed throughout, with about 47 ribs 

 on the penultimate whorl. The last whorl is conspicuously flattened 

 on. the back, then gibbous (the gibbosity internally filled with white 

 shelly material) and contracting to the aperture, the basal crest 

 rather conspicuous. These features are more conspicuous than in 

 H. ferrissi. There is an obtuse axial lamella in the front of the last 

 whorl, and typically no other lamellse; but three specimens out of 

 20 opened show a weak parietal lamella also. The color is wood 

 brown or avellaneous, with the usual white patch on the last whorl. 



Length 8.7, diam. 3.3 mm.; lOf whorls (type). 



6.4, • " 3.3 " 8| " (shortest shell). 

 9.8, " 3.6 " 10^ " (largest shell). 

 9.3, " 3.3 " lOf " (slender shell). 



Mule Mountains: on slopes of a limestone peak about 2 miles 

 east of Warren, Arizona. Type No. 112,238, A. N. S. P., collected 

 by Pilsbry and Daniels, August 31, 1910. 



The towT^i of Warren may be reached by a trolley line from Bisbee. 

 It lies lower than Bisbee and is separated from the plain by a range 



- 180 specimens in the lot taken by Pilsbry, probably as many or more taken 

 b}^ Daniels; most of them dead shells. 



