INDEX. 
Calyculina securis, 113, 722. 
transversa, 113, 720, 122, 
396. 
truncata, 113, 727, 123. 
CAMPELOMA, 350. 
Campeloma decisum, 356, 358, 359, 
360, 362. 
ponderosum, 3756, 357, 
358, 359, 361. 
rufum, 356, 758, 361. 
obesum, 358. 
subsolidum, 356, 767. 
CARUNCULINA, 109. ° 
CARYCHIUM, 253. 
Carychium euphaum, 254. 
exiguum, 254, 255, 256. 
exile, 255, 206. 
extstelium, 254. 
jamaicenseis, 255, 
mexicanum, 254, 
Chicago bibliography, 363. 
Chrysemys marginatus, 33. 
CINCINNATIA, 335. 
Cionella morseana, 246. 
CIRCINARIA, 777, 174. 
Circinaria concava, 139, 171, 772, 178, 
CIRCINARIIDZ, 7712. 
COCHLICOPA, 245. 
Cochlicopa lubrica, 246, 247. 
COCHLICOPIDA, 245. 
CONULUS, 78. 
Conulus alaskensis, 183. 
chersinus, 7&5. 
mortoni, 183. 
Cotylaspis insignis, 48. 
CTENOBRANCHIATA, 7/0. 
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. 
Suscata, 114. 
gigantea, 116. 
gracile, 120. 
znornata, 117. 
lasmampsis, 116 
lenticula, 121. 
major, 126. 
mirabilis, 123. 
| Cyclas modesta, 117. 
) nitida, 397. 
orbicularia, 123. 
ovaltts, 119. 
pellucida, 121. 
/ ponderosa, 116. 
sarratogea, 116. 
simplex, 117. 
solida, 116. 
/ sulcata, 116. 
sulcosa, 118. 
tenutstriata, 117. 
CYRENACEA, ///. 
CYRENID&, //1. 
| Diplodontus, 52. 
Discus, 204. 
| Distoma appendiculata, 189. 
ascoidea, 299. 
macrostomum, 222. 
| ELASMOGNATHA, 2/0. 
| Elimta, 325. 
| ENDODONTID2, 203. 
| Eubifidaria, 231. 
EUCONULUS, 183. 
Euconulus fulvus, 787, 184, 227. 
Eurynlia, 100. 
EUTHYNEURA, 738. 
Ferussacia subcylindracea, 246. 
GASTRODONTA, J90. 
Gastrodonta arborea, 167. 
brittsii, 192. 
demissa, 191, 792. 
gularis, 190. 
ligera, 190, zgz, 192, 195. 
stonei, 191 
GASTROPODA, 737. 
Geographical Distribution, 16. 
Geological Distribution, 25. 
GEHYDROPHILA, 253. 
Glochidium, 49. 
Glossary, 381. 
GLYPHYALINIA, 177, 782. 
GONIOBASIS, 325. 
Goniobasis depygis, 727. 
livescens, 725, 326, 327, 330. 
milestt, 325, 326. 
translucens, 325. 
GONYODISCUS, 270. 
Gundlachia, 307. 
GYRAULUS, 297. 
Haplotrema, 171. 
HELICID#, 770. 
HELIcopIscus, 204, 272. 
Helicodiscus lineatus, 205, 272, 213. 
HELISOMA, 287. 
| HELIX, 137, 217. 
| Helix alba, 206. 
apex, 189. 
‘ 
Bins WAN held ocak 
