1910.] 



NATURAL SCIENCES OF PHILADELPHIA. 



133 



It seems that there is considerable variation in the minute sculpture 

 of E. fulvus, though it appears to be always somewhat coarser than in 

 E. chersinus and, in the average at least, finer than in E. fulvus alas- 

 kensis. 



Euconulus chersinus (Say) is, of course, a very distinct species from 

 all of the preceding. No conchologist who actually examines fulvus 

 and chersinus with an ordinary hand lens could lump them. Mr. 

 Vanatta's study of the microscopic sculpture has shown that there is 

 little real difference between chersinus and polygyralus, and we are 



Fig. 27. — Euconulus fulvus (Mull.). A, Burnley, England; B, C, Herkimer 

 County, N. Y.; D, Buckfield, Maine. 



now disposed to drop the latter as a synonym. E. chersinus (poly- 

 gyralus) occurs associated with fulvus in some Maine localities. E. 

 chersinus has not been found in New Mexico or Arizona. 



ENDODONTIDiE. 

 Pyramidula (Gonyodiscus) cronkhitei (Newc). 



Foot of talus about half a mile below Reed's place, in Cave Creek 

 Canyon, Station 11; head of cave, 8,000 feet; Barfoot Park; head of 

 Pine Canyon; Long Park, 8,000 feet; "Box" of Rucker Canyon. 



Helicodiscus eigenmaimi arizonensis Pils. and Ferr. 



Quartzite Peak near Fort Bowie ; head of west branch of Big Emigrant 

 Canyon and at Station 2; White Tail Canyon at Stations 4, 10, in 

 the Box Canyon, and on both sides below the junction of Indian Creek; 

 Cave Creek Canyon at Stations 4 and 14, 8,000 feet; Rustler's Park; 

 head of Pine Canyon; Shake Gulch, Limestone Mountain. 



Radiodiscus millecostatus Pils. and Ferr. 



Head of Cave Creek, 8,000 feet, Station 14; Barfoot Park, Station 3; 



