52 THE NAUTILUS. 
small Vertigo. The texture of the shell, as well as the shape, 
are strongly reminiscent of V. occidentalis Sterki, a more weakly 
toothed species from the San Bernardino Mountains. None of 
the other species with which I am familiar require any special 
comparison. V. corpulenta (Morse) has a somewhat similar 
‘outline, but otherwise does not seem especially close. 
VERTIGO ALLYNIANA XENOS, new subspecies. Fig. 8. 
With the preceding occurred a single specimen of a very 
similar form having the same number of teeth, but differing 
abruptly in its shorter, much more robust and swollen outline, 
its more transparent, glossier texture, and lighter brown color. 
The columellar tooth is placed distinctly further down on the 
pillar, and the remaining lamellae differ slightly from those of 
the shells described above both in size and position. 
Length of type 2.0; diameter to lip edge 1.5; length of aper- 
ture 0.85 mm.; whorls 43. 
Type: Cat. No. 4128 of the writer’s collection. 
Type Locality: Donner Lake, California; A. G. Smith, May 
30, 1916; 1 specimen. 
EXPLANATION OF FIGURES. 
Figs. 1-5. Vertigo modesta microphasma Berry. Camera 
drawings of type (Fig. 2) and four other specimens of the 
original lot, showing variation in number of lamellae and shape 
of shell. 
Fig. 6. Vertigo modesta microphasma Berry. Camera draw- 
ing of cephalic region of living animal as extended in crawling. 
Fig. 7. Vertigo allyniana Berry. Camera drawing of type. 
Fig. 8. Vertigo (allyniana var?) zenos Berry. Camera draw- 
ing of type. 
All figures drawn to same scale. 
Redlands, California. 
