126 PROCEEDINGS OF THE ACADEMY OF [Feb., 
8 shells have 1 lamella, the axial. 
5 shells have 2 lamelle, axial and superior. 
Pl. XIII, figs. 1, 2, Station 4, northwest branch of ravine back of 
Gardner’s Mine, about three-quarters of the distance to summit. 
Some of the shells have the terminal cone slightly shorter than in the 
types. Sculpture variable, as shown in the figures. Internal lamelle 
1, 2 or 3. In 20 specimens opened: 
10 have 1 lamella, the axial. 
8 have 2 lamelle, axial and superior. 
2 have 3 lamellee, axial, superior and basal. 
Below Station 5, pl. XIII, figs. 18, 14. The shells are small and 
ribbed throughout, rarely over 9 mm. long. 
Box Canyon.—In the Box Canyon, at two stations, one some dis- 
tance below Station 5 (pl. XIII, figs. 6, 7, 8), the other at the mouth of 
Indian Creek, the shells are long and slender, strongly ribbed throughout. 
Axial and superior lamelle are present in a few opened. 
Length 13, diam. 3.2 mm.; whorls 14. 
(a9 10, cc 3.2 cc ‘c 114. 
Station 8.—A small series agrees, at least superficially, with those 
from Station 14, which lies about 800 feet lower. 
Station 14.—The shells do not differ much from the type lot. There 
is a longer and coarsely ribbed and a shorter, more closely ribbed, 
form. Of the longer form we opened 10 shells, 1 having three, 4 two, and 
5 one lamelle. In seven of the shorter form opened 1 has two lamelle, 
6 have one lamella. 
Forms from head of Onion Creek.—Two forms are represented in 
the small lot examined. Pl. XIII, fig. 9, shows a slender shell with 
coarse, very widely spaced ribs: length 12, diam 3.3 mm., whorls 123. 
It has one lamella, the axial. Pl. XIII, figs. 10, 11, 12, represents the 
prevalent form, shorter than the preceding, very finely and closely 
ribbed throughout, or the ribs may be weak or subobsolete on the 
penultimate next preceding whorls. In five opened, only the axial 
lamella is present. 
Length 10.5, diam. 3.5 mm.; whorls 114. 
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Jhu Canyon.—At the head of Jhu Canyon a gathering consists of 
two forms, similar to pl. XIII, figs. 9-12, from Onion Creek. The 
larger form is near typical intermedia, but the smaller may represent 
