AIR-BREATHERS als i 
colored spots and a brown band. Found on the 
seaweed side of Point Loma, San Diego, where 
most of the specimens are dead, and in Lower 
California. 
Epiphragmophora arnheimi, Dall, Arnheim’s 
Snail. This small snail is found in Costra Costa 
Co., Cal., near San Pablo. Its diameter is 18mm. 
The suture is deep, also the umbilicus, while the 
lip is unusually thick for the size of the shell. 
Glyptostoma  newberryanum, 
W. G. Binney, Newberry’s Snail, 
is a very distinct species, found 
in southern California, particu- 
larly around San Diego. <A basal 
view of a small specimen is shown 
in Migure 112, for large ones 
grow to a diameter of an inch and a half. The 
spire is flattened, and the umbilicus is very large, 
distinctly showing the coil of rounded whorls. The 
lip of the aperture is thin and acute, the whorls 
are six in number, and the color of the shell is dark 
brown, sometimes almost black. 
Polygyra — townsendiana, 
Lea, Townsend’s Snail. This 
distinct species whose fine, 
large shell is shown in 
Figure 113, is a true north- 
erner, being found mostly in 
Fig. 113 Oregon, Washington, and 
even much farther to the north. The shell is 
strong, the spire but little elevated, the color yel- 
lowish or brownish, sometimes mottled.  Peri- 
stome like a white horse-shoe, umbilicus large and 
