102 PROCEEDINGS OF THE ACADEMY OF [March, 



The lower part of the penis contains two or three fleshy ridges, 

 the upper ends of which project a Uttle into the cavity of the thin- 

 walled portion. 

 Thysanopliora ingersolli (Bid). 



Common throughout the humid forested zone, especially among 

 aspens. Taken at 16 stations, from Sawyer Peak to Black Canyon. 

 Thysanopliora hornii (Gabb). , 



Not found in the Black Range. A few were taken in the Cuchillo 



Alountains. 



UROCOPTID.^. 

 Holospira cockerelli Dall. 



Holospira cockerelli Dall, Nautilus, XI, October, 1897, p. 62. Pilsbry, Proc, 

 A. N. S. P., 1905, p. 218, PL 26, fig. 6. 



Sam's Canyon, about 4 miles south of Chloride. Cuchillo Moun- 

 tains. Big Palomas Creek, near Hermosa, in a mountain across 

 stream, above the fork, at Ocean Wave Mine; also in the next peak 

 below. Little Palomas Creek, in a limestone mountain 2 miles 

 north of Black Bob's ranch. 



The specimens from the Little Palomas are about typical in size: 



Length 12.5 mm., 13| whorls. 

 " 10.5 " 12 



The largest are from the Cuchillo Mountains on the south side 

 of the peak, where some are 16.8 mm. long, with 16| whorls. Speci- 

 mens from the other localities are intermediate in size. All we have 

 opened have a single short lamella low on the axis in the penult 

 whorl. 



The type was found in drift debris of the Rio Grande. Subse- 

 quently Mr. Metcalfe found one "near Kingston" — probably 

 northward near the southern localities given above. 



We did not find Holospira regis Pils. and Ckll., which was collected 

 by Mr. Metcalfe somewhere in the Kingston district. 



ENDODONTID^. 

 Pyramidula cronkhitei (Xewc). 



Found everywhere (18 stations) throughout the wooded zone. 

 Also in the Middle Percha drift below Kingston, Mineral Creek near 

 Chloride, and Little Palomas Creek; probably washed down from 

 above. 



Helicodiscus arizonensis P. and F. 



Rather sparingly found at many stations throughout the Black 

 Range, from the summit to the level of Kingston. Also San Mateo 

 and Cuchillo Mountains. 



