42 THE NAUTILUS. 



The locality is at an elevation of about 7,500 feet, six miles 

 east of Glenwood, Socorro Co., N. M. The canyon was ex- 

 plored only to Kitt's mining cabin. 



AsHMUNELLA PiLSBRYANA Ferriss. PI. 2, figs. 3. 



Ashvmnella pilsbryana Ferriss, Nautilus Vol. 27, p. 109 (1914). 



Distinguished from other species of this region by its acutely 

 angular periphery and granulose surface. 



Ashmunella pilsbrya7ia has not been taken in the Mogollon 

 range, but in the region westward. It has been found only in 

 a small territory along the San Francisco river, and in company 

 with no other large shell except Sonorella. A mile or so back 

 in the hills from the Harper ranch, and four miles above Clif- 

 ton, Arizona, a few dead shells were found in the rock slides. 

 The removal of timber had apparently killed the snails. Only 

 a couple of living Sonorellas were found here in half a day, but 

 no living Ashmunellas. 



Two miles above the mouth of the Blue river colonies of A. 

 pilsbryana and a small Sonorella were found in a thrifty condi- 

 tion, and a couple of smaller colonies were located in between 

 this station and the Harper ranch. All of these are within 

 some twenty miles of river front. These colonies were in shaded 

 talus that ran down to the flood plain. A. pihhryana will 

 probably be found farther up the San Francisco river, but none 

 were found in the vicinity of Alma, New Mexico. The rock in 

 that stretch of river may have held mineral qualities distasteful 

 to all snails. 



Ashmunella mogollonensis Pils. 



This fine species is rather widely spread in the Mogollons. 

 It was found in 24 colonies in Silver Creek canyon, in the village 

 along the Bursam road (a trail running east from Mogollon 

 across the crest of the range) to Willow Creek, and again in Big 

 Dry Creek Canyon. The latter were large and bright- colored, 

 distinctly striated with incised spiral lines on all but the em- 

 bryo whorls. One measures 10.8 mm. alt. by 22 mm. diameter. 



Shells from the colonies upon Silver and Willow Creeks varied 

 much in size, though some colonies had large and small. The 



