INDEX. 



Calyculina securis, 113, 122. 



transversa, 113, 120, 122, 



396. 



truncata, 113, 121, 123. 

 CAMPELOMA, j>jd. 

 Campeloma decisum, 356, 358, JJQ, 



360, 362. 

 ponderosum, 356, 357, 



358, 359, 361. 

 rufum, 356, jj,?, 361. 

 obesum, 358. 

 subsolidum, 356, j><5/. 

 CARUNCULINA, 109. 

 CARYCHIUM, 253. 

 Carychium euphceum, 254. 



exiguum, 254, 255, 256. 

 exile, 255, 256. 

 existelium, 254. 

 jamaicenseis, 255. 

 mexicanum, 254. 

 Chicago bibliography, 363. 

 Chrysemys marginatus, 33. 

 CINCINNATIA, j>j>j. 

 Cionella morseana, 246. 



ClRCINARIA, /7/, 174. 



Circinaria concava, 139, 171, 172, 173, 

 174. 



ClRCINARIID^E, /7/. 

 COCHLICOPA, 245. 



Cochlicopa lubrica, 246, 247. 



COCHLICOPID^E, 245. 

 CONULUS, 7<?j>. 



Conulus alaskensis, 183. 

 chersinus, 185. 

 mortoni, 183. 

 Cotylaspis insignis, 48. 

 CTENOBRANCHIATA, 379. 

 Cyclas, 111. 

 Cyclas acuminata, 117. 



albula, 117. 



altilis, 128. 



bulbosa, 114. 



caerulea, 123. 



calyculata, 121. 



cardissa, 122. 



castanea, 118. 



constricta, 120. 



cornea, 123. 



crocea, 122. 



detruncata, 120. 



distorta, 113. 



dubia, 127. 



eburnea, 123. 



edentula, 117. 



fuscata, 114. 



gigantea, 116. 



gracile, 120. 



inornata, 117. 



lasmampsis, 116 



lenticula, 121. 



major, 126. 



mirabilis, 123. 



Cyclas modesta, 117. 



nilida, 397. 



orbicularia, 123. 



ovalis, 119. 



pellucida, 121. 



ponderosd, 116. 



sarratogea, 116. 



simplex, 117. 



solida, 116. 



sulcata, 116. 



sulcosa, 118. 



tenuistriata, 117. 

 CYRENACEA, 777. 



CYRENIDJi, 777. 



Diplodontus, 52. 



Zto, 204. 



Distoma appendiculata, 189. 



ascoidea, 299. 



macrostomum, 222. 



.ELASMOGNATHA, ,?7<5. 

 Elimia, 325. 

 ENDODONTID^E, .?oj. 

 , Enbifidaria, 231. 



EUCONULUS, 755 1 . 



Euconulus fulvus, 7<?j, 184, 227. 



EURYNIA, 100. 

 EUTHYNEURA, Ij8. 



Ferussacia subcylindracea, 246. 



GASTRODONTA, 790. 

 Gastrodonta arborea, 167. 



brittsii, 192. 



demissa, 191, 192. 



gularis, 190. 



ligera, 190, 797, 192, 193. 



stonei, 191. 

 GASTROPODA, 7^7. 

 Geographical Distribution, 16. 

 Geological Distribution, 23. 

 GEHYDROPHILA, 253. 

 Glochidium, 49. 

 Glossary, 381. 

 GLYPHYALINIA, 177, 182. 

 GoNioBASis, 325. 

 Goniobasis depygis, j>^7. 



livescens, ^,326,327, 330. 

 milesii, 325, 326. 

 translucens, 325. 



GONYODISCUS, 210. 



Gundlachia, 307. 

 GYRAULUS, 297. 



Haplotrema, 171. 

 HELICID^:, 140. 

 HELICODISCUS, 204, 212. 

 Helicodiscus lineatus, 205, 212, 213. 

 HELISOMA, 287. 

 HELIX, 137, 217. 

 Helix alba, 206. 

 apex, 189. 



