ADDITIONS AND CORRECTIONS. 377 



"Type Locality: Donner Lake, California; A. G. Smith, 

 May 30, 1916; 22 specimens" (Berry}. 



Vertigo aUyniana BERRY, Nautilus, vol. 33, Oct. 1919, p. 51, 

 fig. 7. Vertigo allyniana xenos BERRY, op. cit., p. 52, f. 8. 



""I am not quite certain of the relationships of this small 

 Vertigo. The texture of the shell, as well as the shape, are 

 strongly reminiscent of V. occidentals 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" 

 (Berry). 



Two paratypes measure : 



Length 2.18, diam. 1.4 mm. 



Length 2.1, diam. 1.27 mm. 



The holotype of V. a. xenos measured the same way : 



Length 2.1, diam. 1.45 mm. 



The latter form, based upon a single shell, found with 

 typical attyniana, appears likely to be merely a shape muta- 

 tion. Variation of contour equal to this is of common occur- 

 rence in single colonies of many Vertigos, and in the absence 

 of series sufficient to show that there is racial differentiation 

 they are better left nameless. 



In washing a specimen of the typical allyniana the color 

 and texture appear to be exactly as in the type of xenos. 



Mut. xenos (Berry), 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, glos- 

 sier texture, and lighter brown color. The columellar tooth 

 is placed distinctly further down on the pillar, and the re- 

 maining lamellae differ slightly from those of the shells de- 

 scribed above both in size and position. Length of type 2.0; 

 diameter to lip edge 1.5 ; length of aperture 0.85 mm. ; whorls 

 4i/ 2 . Type: Cat. no. 4128 of the writer's collection" (Berry). 



VERTIGO CALIFORNIA ELONGATA (Sterki). Page 142. 



The name el-ongata is several times preoccupied in both 

 Pupa and Vertigo. It may stand as Vertigo calif ornica longa. 



