INDEX TO VOLUME I. 
Academy of Natural Sciences, its 
Journal, 35. 
Acephaia, 92, 96. 
Achatina, Lk. 128. 
gracillima, Pf. 109, 12S, 162. 
pellucida, 109, 128, 162. 
Acknowledgments to co-laborers, 23. 
Agatina variegata, Raf. 50. 
fuscata, Raf. 50. 
Agriculture, influence on species, 
132, 190. ' 
American Zoology, neglect of by 
Europeans, 56. 
Amnicola, 181. 
Analogues, use of the term, 77. 
Anatomy oi terrestrial gasteropods, 
198. v ' 
Ancylus, 97. 
Aorta, 238. 
Aplodon, Raf. 49. 
Arion, 97, 163, 165, 16S, 171, 172 
203, 205, 209, 220, 236. 
horlensis, 109, 159, 19S. 
Asiphonobranehiata, Bl. 95, 96. 
Atlantic region, features of, 103: spe- 
cies of, 109. 
Auricula, 97. 
Auriculidas, 96, 97. 
Azeca, 168. 
Birds, destruction of species by, 134 
Blainville, definition of Mollusks. 92 
Blood, 239. 
Boston Society of Natural History, its 
Journal, 35. 
Buccal body, 206, in Glandina, 214 
Bulimus, 97, 111, 124, 128, 103, 165, 
167, 171, 173, 202, 204. 229. 
acicula, 159. 
vol. I. 07 
Bulimus acutus, Fer. 152, 159. 
dealbatus, 109, 122, 12S, 162, 
199 213 229. 
decoll'atus,' 109,' 128, 134, 152, 
158, 159, 1S8, 199, 213, 230. 
exiguus, 109, 128, 129, 140. 
fallax, 109, 128, 129. 
fasciatus, 109, 119, 12S, 152, 
153, 246, 160, 162, 199, 213, 
210, 229. 
harpa, 109, 125, 126, 129. 
lubricus, 109, 128, 129, 137, 139, 
144, 151, 152, 157, 159. 
octona, 159. 
radiatus, 109. 
subula, 109, 12S, 153, 162. 
serperastrus, 109, 128. 
undatus, 109, 119, 159. 
virgineus, 109. 
virgulatus, 109, 119, 128, 152, 
153, 199, 213, 230. 
zebra, 128, 152, 153, 160, 162. 
Cabinet specimens, insuflicient for 
study, 72. 
Calcareous rudiment, 200. 
Causes, influencing geographical dis- 
tribution of species, 99 ; mountain 
ranges, 110; rivers and lakes, 107; 
ocean, 10S ; climate, 110; geologi- 
cal structure, 112; vegetation. 113; 
humidity and dryness, 113; eleva- 
tion, 115; inundations of rivers 
130; fires, 131; agriculture, 132; 
destruction by animals, 133; the 
sea, 135; local, 138. 
Central region, features of, 103 ; spe- 
cies of, 109. 
