AMERICAN SPECIES OP VERTIGO. 143 



' ' One peculiarity is that in about one-third of the examples 

 a part of the shell is wanting, always on the side of the aper- 

 ture, so that 3 or even 4 whorls are opened. This can hardly 

 be accidental, and probably that part of the thin shell is worn 

 off by friction in moving" (Sterki). 



This race has four well-developed teeth, the parietal lamella 

 being long, as in V. c. elongata, from which it differs by the 

 smaller size and shorter whorls; it is also more fragile. A 

 paratype is figured (fig. 6), and a longer shell from Santa 

 Barbara Island (fig. 5). 



The Santa Barbara Island specimens are somewhat perplex- 

 ing. Some are typical catalwaria, 1.75 x 1 mm., but also up 

 to 2.15 Trim, long, while there are also stouter shells with them, 

 2 to 2.25 mm. long, 1.15 wide, which seem referable to 

 elongata. If it were not for these examples, I would consider 

 catalinaria specifically distinct. 



29 /. Vertigo calif ornica cupressicola Sterki, n. subsp. PI. 9, 

 fig. 10. 



Small, cylindric, with the riblets distant, irregular and 

 partly obsolete ; apertural lamellae and folds relatively larger 

 than in californica, the parietal lamella long. Length 1.83, 

 diam. 1.1 mm. ; barely 5 whorls. 



California: Cypress Point, Monterey, S. S. Berry, J. C. 

 Paine. Type 118835 A. N. S. P. 



Closely related to V. c. catalinaria, but differing by the 

 weaker, irregular sculpture. In some examples the spire 

 tapers a little more than in the figured type. 



30. VERTIGO ROWELLII (Newc.). PL 9, fig. 7. 



Shell perforate, oblong-ovate, dark horn-colored, shining, 

 translucent, finely striated; apex obtuse; whorls 5, convex; 

 aperture truncately ovate, armed with 4 teeth : one prominent 

 and plicate on the columella, 3 deeply seated within the 

 aperture; peristome slightly reflected. Long. 2, lat. 1 mm. 

 (Newc.). 



California: near Oakland, Newcomb, type loc. ; cienaga 

 north of Bluff Lake, San Bernardino Mts., S. S. Berry. 

 Oregon : Douglas county, F. H. Andrus. 



