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=u 
1910.] NATURAL SCIENCES OF PHILADELPHIA, 129 
Length 12.2, diam. 3.4 mm.; whorls 134. 
6c 1 GOOF Sh epy 06 6 121. 
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66 9.4, COT VO PL 1 166 6c 1 
Station 6, about half way up the northern slope of a long ridge 
which projects into Cave Creek Valley from the western border. 
Fifty-three specimens were taken from a single small colony. The 
frozen ground did not encourage a thorough investigation. Out of 
20 opened, 17 have three internal lamelle and three have only one, 
the axial. 
Holospira chiricahuana optima n. subsp. Pl. XIV, figs. 13-15. 
The shell is larger and perceptibly more slowly tapering than H. 
chiricahuana, with more whorls, and only one internal lamella, the 
axial, in 20 specimens opened. 
Station 5, at the base of the north slope of the ridge mentioned 
above, close to the stream, under stones. The larger size of the shells 
might be thought due to the more humid and shaded situation than that 
inhabited by the typical form, were it not that Holospira prefers hot 
and arid places and does not exist at all in damp situations. A 
single colony found. About 75 shells were taken. Thirty-five of 
them, unselected, measure as follows: 
Length. Diam. Whorls. Length. Diam. Whorls. 
14.3 oii 142 13 3.95 134 
14 4 tae 13 3.0 122 
14 3.9 132 13 3.0 154 
14 3.7 144 13 3.0 134 
13.9 3.7 133 13 3.4 134 
13.9 3.9 132 13 3.2 134 
13.9 3.9 132 2n9 3.6 123 
13.8 3.6 14 12.8 3.9 154 
13.8 3.0 144 1 Ta 3.0 134 
13.6 3.0 143 12.7 3.0 13 
13.5 3.8 14 1256 3.4 134 
13.5 3.5 14 12.5 3.5 134 
13.3 3.8 14 12.1 3.25 15 
13.3 3.4 144 12 3.7 124 
13 3.8 134 12 3.3 134 
13 3.8 134 11.3 3.5 123 
13 3.6 132 11.2 3.9 134 
15 3.5 13 
