AIR-BREATHERS 149 
Limnea adelinae, Tryon, Adeline’s Limnea, is 
a small species found at San Francisco. The shell 
is thin, the body-whorl large, and the inner lip thin 
and reflected. The outer lip is tinged with red 
within; length, 14mm. This shell is also reported 
from central Washington. 
Limnea pilsbryt, Hemphill, is a very small spe- 
cies with a shell only three-eighths of an inch in 
length, from Fish Spring, Nevada. 
Radix ampla, var. utahénsis, Call, the Ample 
Radix. The shell is globose, irregularly ribbed, 
spire small, the last whorl inflated. Length, 17 
mm., or considerably less. This rare form is found 
in Utah Lake, but a similar variety is reported 
from Sonoma Co., Cal. 
Figure 129 gives us a good view of the 
shell of Limnophysa caperata, Say, the 
Wrinkled Pond-shell. The spire consists 
of five rounded whorls, the aperture is oval, 
and the outer lip is shghtly reflexed. This 
Species ranges over a large part of North 
America. 
Limnophysa proxima, Lea, the Next Pond- 
shell, has a spire rather long and slender, with lip 
reflexed and body-whorl partly divided into small, 
flattened squares, like hammered silver. The shell 
is nearly an inch long. From. Utah, also near San 
Francisco, and elsewhere in California. 
Limnophysa refléwa, Say, the Reflexed Pond- 
shell. The shell of this species is narrow and very 
much elongated. The spire is more than one and 
a half times the length of the aperture. It in- 
Fig. 129 
