136 WEST AMERICAN SHELLS 
Epiphragmophoraintercisa, W.G. B., the Horse- 
shoe Snail, has a shell strong, solid, with lines of 
growth distinct crossed by regular spiral lines cut- 
ting the surfaces into little blocks. The aperture is 
oblique and shaped like a horse-shoe. Color, white 
or brown, sometimes obscurely banded; diameter, 
22mm.; from San Clemente and Santa Cruz 
Islands. 
Epiphragmophora tryoni, 
Newe., Tryon’s Snail, is shown in 
Figure 111. The shell is strong 
and solid, globose conical, with a 
rounded apex and five regular 
whorls. » The surface is reticu- 
lated or cut into fine checks by the 
crossing of spiral threads and the lines of growth. 
The color varies from white to brown, and the 
whorls are often banded, while the upper half of 
each whorl is usually darker than the correspond- 
ing lower half. The animal is said to be black. 
Chiefly from Santa Barbara Island. 
Epiphragmophora  kelléttu, Ebs.,  Kellett’s 
Snail. The shell consists of six whorls, spire 
rather low, umbilicus nearly closed. Shell smooth, 
eolor varying from whitish to brown, usually 
mottled, with a dark ring around the center of the 
body-whorl. Diameter about an inch. From Cata- 
lina Island, where it is reported as plentiful on 
and under the old cactus branches. 
Epiphragmophora stearnsiana, Gabb., Stearns’s 
Snail, is sometimes called a variety of the last 
species. The shell is narrowly umbilicated, solid, 
with fine incremental striw. Whitish, with ash- 
Fig. 111 
