116 WEST AMERICAN SHELLS 
a looking glass, however, it appears quite correct. 
Some specimens grow to a considerably larger 
size. The epidermis is yellowish green, while the 
interior of the shell is white. There are five whorls, 
the last one being flattened above, at the aperture. 
A dark colored variety is found in Alaska. As 
the name indicates, this species makes its home 
about Puget Sound, but it extends down to Cali- 
fornia, and eastward to Idaho and Montana. The 
var. keepi, Hemphill, is a perfect minature of the 
species and is reckoned as an extremely small 
variety of the same. It is found in the Contra 
Costa hills, back of the city of Oakland. 
Selenites sportélla, Gld., the Sportive Selen, 
(Macrocyelis sportella), is decidedly smaller than 
the normal form of the last species. Its color and 
shape are similar, but it is marked by sharp 
growth-striex. The difference is most plainly seen 
on the base of the shell which in the last species is 
smooth, while in this it is decidedly striated. For 
localities refer to the general ‘‘List of Species,’’ 
near the close of the book. 
Figure 100 shows us a basal view of 
Selenites voyana, Newe., Voy’s Selen, 
(Macroecyclis voyana). Notice the wide 
umbilicus and the triangular aperture. 
The shell is thin, triangular, and of an "*'™™ 
olivaceous horn-color. California coast. 
Selenites hemphili, W. G. B., Hemphill’s Selen, 
is a small species, half an inch across, thin, glossy, 
marked by irregularly impressed lines of growth, 
without any trace of revolving lines. This shell is 
also known as Circinaria hemphilli. Oregon. 
