262 
INDEX. 
Cephalopoda, Cnv. 92, 96. 
Cervicobrancliiula, 131. 95, 96. 
Chiinotrema, Raf. 49. 
Choice of specific names, 77. 
Circular system of arrangement, S9. 
Circulatory apparatus, 235. 
Cirrhobranchiala, Bl. 95, 96. 
Classification, S4. 
Clausilu, Lk. 165, 167, 168, 169, 
172. 
Climate, influence on species, 110. 
Cloaca, in Limax, 220 ; in Arion, 
220 ; in Tcbennophorus, 221 ; in 
Helix, 22S; in Suecinea, 231; in 
Glandina, 232. 
Conchology, auxiliary to geology, 69. 
Corvus corone, 76- 
Cryptobranchiata, Desh. 95, 96. 
Cryptoicus, Leidy, 234. 
Cuba, genera in, compared with U. 
States, 171. 
Currents, agency of, in the introduc- 
tion of species, 152. 
Cuvier, division of Mollusks, 92. 
Ci-clostoma, Lk. 97, 111, 124, 163, 
166, 167, 168, 171, 174. 
campanulatum, 109. 
dentalum, 109, 119, 12S, 153, 
162. 
distribution of species, 172. 
Ci-lindrella, Pf. 97, 163, 165, 166, 
168, 171, 172. 
jejuna, 109, 228. 
lactaria, Gould, 109, 119, 128, 
153, 162. 
Cyrena, 178. 
Dart sac, in Tebennophorus, 221 ; in 
Helix, 227. 
Dental plate, 206; in Pupa, 213 ; in 
Suecinea, 213. 
Destruction of species by animals, 
133. 
Digestive apparatus, 206. 
Distoma vagans, 239. 
Distribution of genera and species, 
compared with those of Eu- 
rope and South America, 163. 
of the nerves, 239, 241. 
D'Orbigny, genera in S. America, 
170. 
Dryness, influence on species, 113. 
Eggs, number of, 194 ; development 
of, 195; tenacity of life, 195, 196. 
Elevation, influence of, on species' 
115. 
Epididymis, 21S, 232. 
Eumelus, Raf. 52, 53. 
nebulosus, Raf 52. 
lividus, Raf. 52. 
European naturalists, neglect of Ame- 
rican labors, 56. 
External characters of equivocal spe- 
cific value, 07. 
Eye, structure of, 247. 
Faculties of land-lliollusks, 1S7. 
Fires, influence on species, 131. 
Fossil laud-shells, 180. 
Ganglia, supra-cesophageal, 239 ; 
sub-ocsophageal, 240 j slomato-gas- 
trie, 241. 
Gasteropoda, 92, 93, 96 ; naked, 199 ; 
testaceous, 201. 
Genera and species, geographical dis- 
tribution of, 99, 128, 162 ; number 
of, 163; geological relations, 170. 
Generative apparatus, 201, 217 ; in 
Limax, 217; iu Arion, 220; 
in Tebennophorus, 220 ; in 
Vaginulus, 221 ; tissues of, 
232. 
bladder, 234; in Limax, 219; 
in Arion, 220; in Tebenno- 
phorus, 220; in Vaginulus, 
222 ; in Helix, 226 ; in Buli- 
mus, 229; in Pupa, 230; in 
Suecinea, 231 ; in Glandina, 
231. 
Geographical distribution of genera 
and species, 99, 162 ; table of, 
109, 128. 
features of the country, 100. 
Geological relations of land-shells, 
176. 
structure, influence on species, 
112. 
Glasdina, 97, HI, 114, 121, 124, 128, 
163, 166, 107, 171, 174, 202, 
214, 231, 242. 
truncata, 109, 128, 134, 102, 
199. 
Vanuxemensis, 109, 12S. 
Gnalhodon, 178. 
Habits and faculties of land mollusks, 
187 ; different from those of Europe, 
1SS. 
Hammocks of Florida, IIS. 
Haste to describe species, an obsta- 
cle, 74. 
Hearing, organ of, 246. 
Heart, 235, 238; in Limax, 236; in 
Vaginulus, 237 ; pulsations of, 238. 
Helicodonta, 166. 
Helices described by Say, 59. 
HdicuUe, 97, 192, 193, 195, 196. 
Helicijja, 97, 111, 121, 124, 127, 163, 
166, 167, 171, 172, 174, 182. 
distribution of species, 172. 
chrysoeheihi, 109. 
occulta, 109, 181, 182. 
orbiculata, 109, 121, 12S, 137, 
162. 
