1910.] NATURAL SCIENCES OF PHILADELPHIA. 133 
It seems that there is considerable variation in the minute sculpture 
of FZ. fulvus, though it appears to be always somewhat coarser than in 
E. chersinus and, in the average at least, finer than in F. fulvus alas- 
kensis. 
Euconulus chersinus (Say) is, of course, a very distinct species from 
all of the preceding. No conchologist who actually examines julvus 
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 polygyratus, and we are 
Fig. 27.—Euconulus fulvus (Mill.). A, Burnley, England; B, C, Herkimer 
County, N. Y.; D, Buckfield, Maine. 
now disposed to drop the latter as a synonym. £. chersinus (poly- 
gyratus) occurs associated with fulvus in some Maine localities. LE. 
chersinus has not been found in New Mexico or Arizona. 
ENDODONTIDA. 
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 eigenmanni 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; 
