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 4J. 



Type: Cat. No. 4128 of the writer's collection. 



Type Locality: Dormer 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 ?) xenos Berry. Camera draw- 

 ing of type. 



All figures drawn to same scale. 



Redlands, California. 



