384 EXPLANATION OF PLATES, VOL. XXV. 



FIGURE PAGE 



6. Vertigo c. catalinaria St. S. Catalina I. 62362 142 



7. Vertigo rowelli Newc. Douglas Co., Ore. 76372 143 



8. Vertigo c. diegoensis St. San Ramon. 64578 141 



9. Vertigo c. trinotata St. Monterey. 62363 140 



10. Vertigo c. cupressicola St. Cypress Point. 118835.. 143 



11. Vertigo c. diegoensis St. San Ramon. 64578 141 



12. Vertigo columbiana St. Vancouver I. 68881 108 



13. Vertigo columbiana St., var. Olympia. 11661 108 



PLATE 10. 



1. Vertigo modesta Say. Laggan, Alberta, 76375 123 



2. Vertigo modesta Say. Loess, Des Homes, la, 79797. . 123 



3. Vertigo m. corpulenta Mse. Ogden canvon, Utah. 



11663 130 



4. Vertigo m. parietalis Anc. Ogden canyon, Utah. 



11659 128 



5. Vertigo m. castanea St. Rae Lake, Cal. 115214 132 



6. Vertigo m. castanea St. Type, Fish Camp, Cal. 11655. 132 



7. 8. Vertigo arctica Wallenb. After Wallenbaum 189 



8. Vertigo concinnula Ckll. Type, Custer Co., Colo. 



59095 119 



10. Vertigo concinnula Ckll. Jemez Mts., N. M. 73587. . 119 



11. Vertigo occidentals St. Bluff Lake meadow, San 



Bernardino Mts. 105048 134 



12, 13. Vertigo m. insculpta Pils. Mt. Lemon, S. Cata- 



linas. 109538, 109547 131 



PLATE 11. 



1. Vertigo dalliana St. Type, 416 Sterki coll 137 



2-5. Vertigo sterkii Pils. Type and paratypes. 43706 . . 112 



6, 8. Vertigo a. sanbernardinensis Pils. Cienaga below 



Bluff Lake. 118419 Ill 



7. Vertigo a. sanbernardinensis Pils. 20 miles north of 



Yosemite. 114796 Ill 



9. Vertigo andrusiana Pils. Oswego, Ore. 11398a 109 



10. 11. Vertigo andrusiana Pils. (Fig. 10 the type.) 



Douglas Co., Ore. 76380 109 



12. Vertigo binneyana St. Paratype. Helena, Mont. 



11672 90 



PLATE 12. 



1-3. Vertigo tridentata Wolf. Fig. 2 the type. Canton, 



111. 58008 . 106 



