NATURAL SCIENCES OF PHILADELPHIA. 121 
1910.] 
The smallest individual in the lot measures, length 11, diam. 3.4 
whorls 124. It has superior and axial lamelle. 
In another lot from a colony not far from Station 1, in 20 shells 
Pd 
opened the proportions are: 
Three lamellz, superior, axial and basal.................... 4 specimens, 20% 
Ee nt Mantel. 298: 10 ig 50% 
i a3 O7 
6 30% 
Two lamelle, superior and axial 
emomamiella, Che axial... foe wok sce osdedinssacessee 
Two other small lots were taken a mile or two southeast from 
Station 1, the shells resembling the type lot, though perhaps there 
may be a greater proportion of slender specimens among them. 
H!GH RIDGE 
Plin 
Ydws 
\ 
ty 
« 
o 
a 
= 
& 
2 
& 
Fig. 25.—Principal collecting stations in Big Emigrant Canyon. 
