264 



INDEX. 



Helix tridentata, 50, 109, 111, 115, 

 121, 12S, 129, 199, 211, 224, 

 225, 226, 228. 

 Iriodonta, Jan. 162. 

 towiisendiana, 109. 

 tudiculala, 109. 

 vancouverensis, 109, 

 variabilis, C. 159. 

 virgata, 1.52. 

 Hemiloma, Raf. 52, 53. 



ovata, Raf. 53. 

 Humidity, inttueiice on species, 113. 

 Identity of species on botli conti- 

 nents, 75. 

 Inferobranchiata, Bi. 95, 96. 

 Injuries, reparation of, 196. 

 Intestine, 208 ; in Helix, 212 ; in Suc- 



cinea, 213. 

 Introduction of foreign species, 150 ; 



agency of currents in, 152. 

 Inundations of rivers, influence on 



species, 130. 

 Invertebrate animals, 85. 

 Kidney, in Limax, 236 ; in Arion, 236. 

 Lakes, inlluence on the range of spe- 

 cies, 107. 

 Leidy, anatomy of terrestrial gastero- 

 poda, 198. 

 Limacidse, 97, 165, 171, 172, 192, 193, 



195. 



LiMAX, 97, 123, 128, 163, 165, 167, 



168, 171, 172, 173, 195, 202, 



203, 205, 206, 217, 220, 235, 



240. 



campestris, 109, 128, 129, 198, 



207, 208, 209, 210, 218, 219. 

 agrestis, 109, 128, 129, 134, 1.52, 



1.58, 159, 188, 195, 198, 207, 



208, 218, 219. 

 gracilis, Raf 53. 

 variegatns, 109, 128, 129, 134, 



152, 158, 159, 1S8, 19S, 207, 

 208, 213, 216. 



Limniadee, 76, 97, 178. 



Lintjual lamina, 206; in Glandina, 

 215. 



Lininea, 97, 181. 



Liver, 209, 217 ; in Helix, 212. 



Local circumstances, influence on 

 species, 138. 



Locality, a cause of variation of spe- 

 cies, 65. 



Lung, in terrestrial gasteropods, 235. 



Maclurian Lyceum, its Contributions, 

 35. 



Mantle of Mollusks, 199. 



Menoraphis, Raf. 49. 



Me.sodon, Raf 49. 



Mesomphix, Raf. 49. 



Mollusca, 90, 92, 90. 



Mollusks, Blainville's defmition of, 



92 ; Cuvier's division of, 92 ; to be 

 studied with their shell, 69. 



Monopleurobranchiata, Bl. 95, 96. 



Mountain ranges, influences on spe- 

 cies, 101. 



Mucous glands, 204. 

 membrane, 216. 



Multifid vesicles, 229. 



Muscles, 205. 



Naiades, 178. 



Naked terrestrial gasteropoda, 199. 



Neritina, 178. 



Nerves, distribution of, 239, 241 ; 

 structure of, 243. 



Nervous centres, 239 ; composition 

 of, 242. 



New York Lyceum, its Annals, 35. 



Nucleobranchiata, Bl. 95, 96. 



Nudibranchiata, Cuv. 95, 96. 



Obstacles to the study of Zoology, 

 63. 



Odomphium, Raf. 49. 



Odotropis, Raf. 48. 



Omphalina, Raf. 49. 



Orders of Mollusca, 94. 



Organs of sense, 243. 



CEsophagus, 207 ; in Helix, 211; in 

 Buliinus, 213; in Glandina, 215. 



Otoconites, 247. 



Ovary, 233; in Limax, 219; in Te- 

 bennophorus, 220; in Vaginulus, 

 222 ; in Helix, 225. 



Oviduct, 234; in Limax, 219; in Te- 

 bennophorus, 220 ; in Vaginulus, 

 222; in Helix, 225; in Buliinus, 

 229. 



Pacific region, features of, 102 ; spe- 

 cies of, 109. 



Parmacella, 167, 168. 



Partula Otaheitana, 159. 



Pedal disk, 199, 201. 



Penis, in Limax, 218 ; in Arion, 220 ; 

 in Tebennophorus, 220 ; in Vaginu- 

 lus, 222 ; in Helix, 224 ; in Buli- 

 mus, 229 ; in Pupa, 230 ; in Suc- 

 cinea, 231 ; in Glandina, 231. 



Pericardium, 238. 



Philomycus, Raf 51, 53. 

 flexuolaris, Raf 52. 

 fuscus, Raf 52. 

 oxyurus, Raf. 52. 

 quadrilus. 51. 



Physa, 97. 



Plauorbis, 97, 181. 



Pneumobranchiata, Lam. 94, 96, 97. 



Points of origin of species, 141. 



Prioritjr, rule of, 22. 



Prostate gland, 233 ; in Succinea, 

 231. 



Pulmonary cavity, in Limax, 235; 

 in Arion, 236 ; in Tebennophorus, 



