264 
INDEX. 
Helix iridentala, 59, 109, 111, 115, 
121, 128, 129, 199, 211, 224, 
225, 226, 228. 
triodonta, Jan. 162. 
townsendiana, 109. 
tudiculata, 109. 
vaneouverensis, 109. 
variabilis, C. 159. 
virgata, 152. 
Herailoma, Raf. 52, 53. 
ovata, Raf. 53. 
Humidity, influence on species, 113. 
Identity of species on both conti- 
nents, 75. 
Inferobranckiata, Bl. 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, influence on the range of spe- 
cies, 107. 
Leidy, anatomy of terrestrial gastero- 
poda, 198. 
Limacida;, 97, 105, 171, 172, 192, 193, 
195 
Limax, 97, 123, 128, 163, 165, 167, 
168, 171, 172, 173, 195, 202, 
203, 205, 206, 217, 220, 235, 
246. 
campestris, 109, 12S, 129, 19S, 
207, 208, 209, 210, 218, 219. 
agrestis, 109, 128, 129, 134, 152, 
158, 159, 188, 195, 198, 207, 
208,218,219. • 
gracilis, Raf. 53. 
variegatus, 109, 128, 129, 134, 
152, 158, 159, 1S8, 19S, 207, 
208,213,210. 
Lininiadre, 76, 97, 178. 
Lingual lamina, 206 ; in Glandina, 
215. 
Liinnea, 97, 181. 
Liver, 209, 217 ; in Helix, 212. 
Local circumstances, iniluence on 
species, 13S. 
Locality, a cause of variation of spe- 
cies, 65. 
Lung, in terrestrial gasteropods, 235. 
Maclurian Lyceum, its Contributions, 
35. 
Mantle of Mollusks, 199. 
Menomphis, Raf. 49. 
Mesodon, Raf 49. 
Mesomphix, Raf. 49. 
Mollusca, SO, 92, 96. 
Mollusks, Blainville's definition 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, '-'11. 
structure of, 243. 
Nervous centres, 239; composition 
of, 242. 
New York Lveeum, its Annals, 35. 
Nucleobranchiata, Bl. 95, 96. 
Nudibranchiata, Cuv. 95, 96. 
Obstacles to the study of Zoology, 
63. 
Odomphium, Raf. 49. 
Odotropis, Raf. 4S. 
Omphalinn, Raf. 49. 
Orders of Mollusca, 94. 
Organs of sense, 243. 
(Esophagus, 207 ; ia Helix, 211; in 
Bulimus, 213; in Glandina, 215. 
Otoconiles, 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 Bulimus 
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 Arinn, 220 ; 
in Tebennophorus, 220 ; in Vaginu- 
lus, 222; in Hehx, 224; in Buli- 
mus, 229 ; in Pupa, 230 ; in Suc- 
cinea, 231 ; in Glandina, 231. 
Pericardium, 238. 
Philomycus, Raf. 51, 53. 
tlexuolaris, Raf. 52. 
fuscus, Raf. 52. 
oxyurus, Raf. 52. 
quadrilus, 51. 
Physa, 97. 
Plauorbis, 97, 1S1. 
Pneumobranchiata, Lam. 94, 96, 97. 
Points of origin of species, 141. 
Priority, rule of, 22. 
Prostate gland, 233; in Succinea, 
231. 
Pulmonary cavity, in Limax, 235; 
in Arion, 236 ; in Tebennophorus, 
