68 THE NAUTILUS. 
OvuTLet oF Lone Lake. 
Galba randolphi (Baker). Half-grown and typical. 
Galba vahlu (‘‘ Beck’’ Moller). 
Planorbis similaris Baker. 
Two young individuals (three whorls) of a small Planorbis 
are indistinguishable from specimens of similaris of the same 
size from Colorado. They are not like parvus from near Phila- 
delphia, having a less number of whorls in specimens of the 
same size, and the base lacks the reamed-out appearance so 
characteristic of typical parvus. The two localities are widely 
separated although the ecological and general climatic condi- 
tions are the same, the Colorado specimens occurring in a lake 
at an altitude of 8575 feet (see Bull. Amer. Mus. Nat. Hist., 
Vol. XLI, p. 532, 1919). This small Planorbis will doubtless 
be found in many places between these extreme localities, when 
it is discriminated from parvus. 
Pisidium species. 
Sterki says of this Pisidium, of which only four specimens 
were collected, ‘‘ unknown to me; probably immature.”’ 
Saint ANNE LAKE. 
Galba randolphi (Baker). Half-grown specimens. 
Galba vahlii (‘‘ Beck’’ Moller). 
The lymnaeids referred to vahlii were at first thought to be 
referable to palustris. The generally thinner, almost paper-like 
shell and the wide columella callus without well-marked plait 
seem to place them rather under vahlii. The spire in nearly all 
of the specimens is very long and the whorls are inclined to be 
flat-sided, differing in this respect from typical vahlii. This 
species, like the protean palustris, of which it is a near relative, 
probably exhibits a wide range of variation. 
Valvata lewisii helicoidea Dall. 
A single specimen of Dall’s variety of Valvata lewisii occurred 
with the material from Saint Anne Lake. It corresponds in 
every way with the original description and figures (Alaska 
Mollusks, p. 123, pl. ii, figs. 1, 2) but is smaller than the speci- 
men figured by Dall. The measurements of the Saint Anne 
Lake specimen are: height 2.2; greatest diameter4 mm. The 
