AMERICAN SPECIES OF VERTIGO. 129 



Rocky Mountain region etc., the type locality Ogden 

 canyon, Utah. 



Pupa, corpulenta Morse var. parietalis ANCEY, Conchologists 

 Exchange ii, Dec. 1887, p. 80 (Ogden canyon, Utah). Vertigo 

 modesta parietalis Anc., PILSBRY & VANATTA, Proc. A. N. S. 

 Phila. 1900, p. 601, pi. 23, f. 1. HENDERSON, Univ. of Colo. 

 Studies iv, p. 172 (Delta and Ouster counties, Black Lake 

 Creek, Cockerell; North Park, Barber}. COCKERELL, Nau- 

 tilus xxv, 59 (Tolland, Colo.). BERRY, Nautilus xxix, p. 127 

 (Big Snowy Mts., Mont.). 



In the Sierra Nevada counties of California V. modesta and 

 parietalis appear to be rather abundant. They were collected 

 in the valleys of the San Joaquin and King's rivers, Bear 

 and Fish Creeks, Fresno county, in many places by Mr. 

 Ferriss in 1917. In some lots four-toothed forms occurred 

 with parietalis, the latter in the majority. 



Lots from Pumice Flats, San Joaquin river, Bear Creek and 

 Grouse Meadow, Kings river, are quite distinctly striate, much 

 as in the Arizonian insculpta. In one lot from Simpson's 

 meadow, Kings river, there are apparently adult shells having 

 5, 4 and 2 teeth (columellar and lower palatal). By individ- 

 uals these specimens could be referred to parietalis, modesta 

 and casta-nea. 



Other Calif ornian forms of the species are noticed under 

 occidentalis and castanea. 



The size and shape are variable in the same lots. The 

 shorter shells having 5 whorls or even less, the larger fully 

 whorls. 



Length 2.4, diam. 1.4 mm., Miller Pk., Huachucas (p. 124, 

 5). 



Length 2.55, diam. 1.3 mm., Miller Pk., Huachucas (p. 124, 

 fig. 5a). 



Length 2.4, diam. 1.3 mm., Boise Co., Idaho. 



Length 2.7, diam. 1.35 mm., Boise Co., Idaho. 



This form is far more generally distributed than the typical 

 corpulenta. In some places, as in in Ogden Canyon, the type 

 locality, the two occur together; but in most localities all of 

 the adult shells are parietalis. As forms with the parietalis 



