INDEX TO VOL. XIII. 



Acarus, 263. 



Acidalia b-linearia, 389. 



Calif orniaria, 390. 

 granitaria, 390. 

 Pacificaria, 391. 

 rubromarginaria, 391. 

 sideraria, 389. 

 Acmasidae, 127. 



Agassiz, Alex. Notes on Beaver 

 Dams, 101 ; on the habits of a few 

 Echinoderms, 104. 

 Agassiz, Louis. Thanks of the Society 

 for his address at the Humboldt cele- 

 bration, 137. 

 Allen, J. A. On the Mammals of 

 Iowa, 178 ; notes on Massachusetts 

 Reptiles and Batrachians, 260 ; trans- 

 ferred from department of ornithology 

 to that of reptiles and fishes, 415. 

 Alixia myosotis, 131. 

 Amnicola limosa, 124. 

 porata, 124. 

 Amphientomum, species of, discovered 



in Brunswick, Me , 272. 

 Amphientomum Hagenii, 405. 

 Amycla dissimilis, 113. 

 Gouldiana, 113. 

 lunata, 113. 

 Anachis avara, 113. 

 Ancylus fuscus, 135. 



rivularis, 135. 

 Anisopteryx ? strigataria, 84. 

 Anisopteryx strigularia, 170. 

 Anguisperma alternata, 128. 

 Angulus polita, 145. 

 tenera, 144. 

 Anodonta cataracta, 155. 

 Anomia ephippium, 160. 

 Anura, 283. 

 Arcadae, 157. 

 Arctomys monax, 190. 

 Argentine Republic, geological sketch 



of, 417. 

 Argina pexata, 157. 

 Arion hortensis, 131. 

 Arvicola austera, 194. 



pinetorum, 194. 

 riparius, 193. 

 Ascidia manhattensis, 160. 

 Astarte lutea, 150. 



Atwood, Capt. N. E. Broken skull of 

 a walrus from the Gulf of St. Law- 

 rence. 220. 

 Aulacodiscus oreganus, 195. 

 Auriculidas, 131. 



Azelina Behrensaria, 386. 

 Hubneraria, 386. 



Baptria Calif orniata, 404. 



Barnard, James M. Elected to nomi- 

 nating committee, 209. 



Beaver Dams, Notes on, 101. 



Bittium Greenii, 127. 

 nigrum, 126. 



Blarina brevicauda, 187. 



Blothrus, 264. 



Boarmia Calif orniaria, 387. 



clivinaria, 387. . 



Boreus Californicus, 408. 



Bos Americanus, 186. 



Bovidaa, 186. 



Brachiopoda, their position in the ani- 

 mal kingdom, 416. 



Brachydontes hamatus, 156. 

 plicatula, 156. 



Brewer, T. M. Remarks on unspotted 

 crow's eggs, 138; on nest of the oriole, 

 411. 



Brigham, W. T. Description of two 

 meteorites, 412; on a deposit of lava, 

 413; morchella found in Grafton, 

 Mass., 413; on sequoia gigantea, 413. 



Brown, F. H. On Ferns and Fern 

 allies from Madeira, 413. 



Buffalo, American, 136. 



Buffalo, bones of, 136. 



Bulfinch St. Fund, 74, 376. 



Bulinus hypnorum, 134. 



Bulla solitaria, 136. 



Bullidae, 136. 



Burgess, Edward. On Dr. Hagen's 

 collections of Neuroptera, 416. 



Burgess Edward, and Scudder, S. H. 

 On asymmetry in the appendages of 

 hexapod insects, 282. 



By-Laws, alteration of, 281; amend- 

 ment, 204. 



Caberodes marginaria, 169. 



Callosamia Promethea, drawing of the 



larva of, 205. 

 Calyptrasidae, 122. 

 Campodea Americana, 409. 

 Canidas, 181. 

 Canis latrans, 181. 



lupus, 181. 

 Cardiadae, 150. 

 Cardium pinnulatum, 150. 

 Carychium exiguum, 131. 

 Castor fiber, 190. 



