366 
INDEX. 
Terrestrial mollusks, comparative ta- 
ble o(, in the United States and 
South America, 170. 
Testacella, 167, 172. 
Testis, y32 ; of Limax, 217 ; in Te- 
bennophorus, 220; in Vaginulus, 
221 ; in Helix, 223, 232 ; in Sue- 
cinea, 231 ; in Glandina, 231. 
Tissues ot'tlie genital organs, 232. 
Touch, organ of, 243. 
Toxotrema, Rat". 49. 
Triodopsis, Raf. 49. 
Trophodon, Raf. 49. 
Turbinated mass, 201. 
Vagina, in Helix, 227, in Bulimus, 
229; in Succinea, 231; in Glan- 
dina, 232. 
Vaginulds, 97, 124, 128, 163, 165, 
166, 168, 171, 173, 200, 210, 
216, 221, 233, 234, 237, 242, 
246. 
flondanus, 109, 119, 128, 198. 
Valvata, 181. 
Varieties, from locality, 65. 
Vas deferens, in Limax, 218 ; in Te* 
bennophorus, 220; in Vaginulus, 
221; in Helix, 223; in Huhinus, 
229; in Pupa, 230; in Glandina, 
231. 
Vegetation, influence on species, 113. 
Vertebrate animals, 85. 
Vertigo, 97, 124, 163, 165, 168, 171. 
decora, 109, 124, 129. 
gouldii, 109, 124, 129. 
milium, 109, 128, 129. 
ovata, 109, 128, 129, 137. 
pentodon, 109, 128, 129. 
Vicissitudes of temperature, influ- 
ence on species, 127. 
Viteina, 97, 111, 116, 125, 126, 163, 
165, 167, 168, 171, 173. 
pellucida, 109, 129, 144, 159, 
162. 
Xolotrema, Raf. 49. 
Zoological foci of genera and species, 
141. 
sections of country, 117; Flo- 
rida, 118; tertiary of the At- 
lantic, 120 ; Southern Inte- 
rior, 122 ; Northern Interior, 
123; Northwestern, 124; 
Northeastern, 125; table of 
species in, 12S. 
Zoology, obstacles to the study of, 
63 ; neglect of American, by 
Europeans, 56. 
of Massachusetts, 30; of New 
York, 36 ; in the United 
States, rise of, 31. 
END OF VOLUME I. 
