AMERICAN SPECIES OF VERTIGO. 125 



City, Des Moines) and Kansas (Phillips Co.). Alaska, abun- 

 dant. The typical modesta replaced in the Rocky Mountain 

 system and California by various weakly differentiated races. 



EXPLANATION OP FIGURES, p. 124. 

 Fig. 1. Vertigo modesta (Say). Photographic copy of 



Gould 's original figure of Pupa decora. 

 Figs. 2, 2a. Vertigo modesta (Say). Loess, Iowa City, Iowa, 



no. 11657. 

 Fig. 3. Vertigo modesta (Say), form resembling V. arctica 



Wallenb. Length 2.6 mm., Norton Bay, Alaska, no. 79561. 

 Figs. 4, 4&. Vertigo modesta ultima Pils. Norton Bay, 



Alaska, no. 79562. 

 Figs. 5, 5a. Vertigo modesta parietalis Anc. Wickersham's, 



Miller Peak, Huachuca Mts., Arizona, no. 97509. 

 Figs. 6, 6a. Vertigo hoppii Moller. Photographic copies of 



Moerch's figures. 



Fig. 7. Vertigo occidentalis St. Type specimen. 

 Figs. 8, 8b. Vertigo modesta parietalis Anc. Bluff Lake, 



San Bernardino Mts., Cal., no. 104659. 

 Fig. 8a. V. m. parietalis Anc. Cienaga below Bluff Lake, 



no. 105167. 

 Fig. 9. Vertigo modesta castanea St. Mouth of Big Arroyo, 



Kern R., Tulare Co., Cal., no. 115204. 

 Fig. 9a. V. m. castanea. Wood's Creek, Tulare Co., no. 



115203. 

 Fig. 9b. V. m. castanea. Onion Valley, Kearsarge Pass, 



Inyo Co., Cal., no. 115199. 

 Fig. 10. Vertigo modesta corpulenta (Morse). Photographic 



copy of Morse's figure. 



Pupa modesta SAY, Long's Second Expedition, appendix, 

 1824, p. 259, pi. 15, fig. 5. Vertigo modesta (Say), PILSBRY 

 & VANATTA, Proc. A. N. S. Phila., 1900, f. 600, pi. 23, f. 2, 3, 

 6. WHITEAVES, Ottawa Naturalist 1905, 171 (Kananaskis, 

 Alberta). JOHNSON, Fauna of New England, 13, Mollusca, 

 1915, p. 213 (Cape Elizabeth, Maine; Stonington, Conn.). 

 HANNA & JOHNSTON, Univ. of Kansas Science Bull, vii, 1913, 

 p. 120 (Pleistocene of Phillips Co., Kansas) . Ball, Alaska, 

 Land and Freshwater Mollusks, p. 29, Harriman Alaska 

 Exped. xiii, 1905 (in Alaska at Killisnoo, Chilkat and Chilkoot 

 valleys, Pyramid Island, Portage Bay, Dyea, Klukwan, Point 

 Romanof at the Yukon delta; St. George Island! St. Paul 



