AMERICAN SPECIES OP VERTIGO. 141 



California: Monterey, Hemphill. 



[Pupa californica] var. trinotata STERKI, Nautilus iv, June, 

 1890, p. 18. 



The figure is from a paratype. 



29&. Vertigo californica diegoeiisis (Sterki). PI. 9, figs. 8, 11. 



"The diminution of the lamellae is going on; none but the 

 apertural is left in this variety, and even that is quite small 

 or a mere trace. In size and shape the specimens are not 

 much different from the Monterey form, which is an inter- 

 mediate one" (Sterki). 



California: San Diego, H. Hemphill, type loc. Lower 

 California: San Ramon, C. R. Orcutt. 



[Pupa californica] var. diegoensis STERKI, Nautilus iv, 

 June, 1890, p. 18. Vertigo diegensis St., BERRY, Nautilus 

 xxx, p. 83 (False Bay near Asher Station). 



In the specimens from San Ramon the parietal lamella is 

 sometimes well developed, and there is very rarely a tuber- 

 cular palatal fold, as in pi. 9, fig. 8. A few examples have 

 no teeth whatever. The least decadent individuals of this 

 race have reached about the same stage of tooth-reduction as 

 V. c. cyclops, and some specimens are not distinguishable from 

 that ; yet as the localities are remote and in regions physically 

 diverse, the resemblance is evidently not due to direct relation- 

 ship, but to parallel evolution. 



Length 2.65, diam. 1.35 mm. ; 5*4 whorls. 



Length 2.35, diam. 1.25 mm. ; 5 whorls. 



29c. Vertigo californica cyclops (Sterki). PL 9 ; fig. 3. 



"Large, conic or ovate conic, or turriculate, umbilicated, 

 rib-like stria? rather strong ; whorls 5, well rounded, with deep 

 suture, the last occupying more than y 2 alt. ; aperture sub- 

 ovate or nearly circular, margins much approximate and the 

 ends protracted, peristome shortly but decidedly expanded ; 

 lamella one, apertural [parietal] , small. Alt. 2.5 ; diam. 1.5 

 mill. For its size, rounded aperture and single lamella I 

 would name this form var. cyclops" (Sterki). 



Length 2.7, diam. 1.45 mm. ; 5 whorls. 



