INDEX 



Abbott, C. C, observations on Cottus 

 Copei Abbott, 2, 15 ; notes on tbe 

 habits of Aphredoderus Sayanus, 

 79, 95 ; on Cyprinus corporalis, &c, 

 152, 154 ; on Squalus americanus, 

 referring it to tbe genus Odontaspis, 

 390, 399. 



vEgiothus, monograph of, by Elliott 

 Coues, 373. 



Ailanthus silk-worm, remarks on, by 

 Dr. Stewardson, 525. 



Allen, Harrison, M. D., descriptions of 

 new Pteropine Bats from Africa, 153, 

 156 ; description of a new Mexican 

 Bat, 334, 359. 



Anableps, description of a new species 

 of, by T. Gill, 3 ; remarks on, by 

 Dr. Le Conte, 21 ; observations on, 

 by Prof. Wyman, 56. 



Anculosa, description of new species 

 of, by I. Lea, 14. 



Anodontfe, descriptions of two new 

 species of, by I. Lea, 56. 



Ants, note on, by S. B. Buckley, 9. 



Aphredoderus Sayanus, notes on the 

 habits of, by C. C. Abbott, 95. 



Auisotremus, by T. Gill, 105. 



Aristelliger, by*E. D. Cope, 494. 



Aulostomatoids, on a new type of, 

 found in Washington Territory, 168. 



Baculites, revision of the species of, by 

 W. M. Gabb, 394. 



Bats, descriptions of new Pteropine. 

 from Africa, by H. Allen, M. D., 156 ; 

 description of a new Mexican, by H. 

 Allen, M. D., 359. 



Binney, W. G., Catalogue of Molluscs 

 from British N. America, 311, 330 ; 

 notes on the Molluscs of California, 

 311, 331. 



Blennoids, on a new generic type of, 

 by T. Gill, 261. 



Bombyx cynthia, (Ailanthus silk- 

 worm,) remarks on, by Dr. Steward- 

 son, 525. 



Brachiopoda, synopsis of American 

 cretaceous, by W. M. Gabb, 18. 



Brown, A. D., descriptions of two new 

 species of Helix, 311, 333. 



Buckley, S. B., notes on Ants in Texas, 

 2, 9 ; note on the Bartram Oak, 334, 

 361 ; description of new plants from 

 Texas, 391, 448. 



Cassin, J., communication in reference 

 to a new species of Goose from Arc- 

 tic America, 72 ; descriptions of new 

 Birds from Western Africa in the 

 Museum of the Academy, 334, 335. 



Centropyx, by E. D. Cope, 494. 



Cephalopod, description of a new car- 

 boniferous, by Wm. M. Gabb, 367. 



Chsenichthyoids , synopsis of, by T. 

 Gill, 507. 



