1910.) NATURAL SCIENCES OF PHILADELPHIA. 75 
HIGH RIDGE 
SUF 
| ex 
Ranch 
ees 
Fig. 6.—Collecting stations in White Tail Canyon. 
rest of the embryonic shell has irregular rugosities or asperities, short, 
but longest in a radial direction ; over these there are granules arranged 
as in S. v. leucura. When absolutely unworn they bear delicate hairs 
in young shells. The following post-embryonic whorls are delicately 
striate, and as far as the beginning of the fourth whorl, fresh and 
uncleaned young shells have close, short and very delicate hairs. The 
last whorl has delicate growth-lines, but no trace of spiral striae; it is 
rounded at the periphery and descends a little in front. The aperture 
is oblique, rounded. The peristome is thin, outer margin scarcely 
