LIST OF CONTRIBUTORS, 



With references to the several Articles contributed by each. 



Butcher, 11. B. List of Birds collected at Laredo, Texas, in 18GG and 18G7, 148 



Cope, Edw. D. An examination of the Reptilia and Batrachia obtained 

 by the Orton expedition to Equador and the Upper Amazon, with 



notes on otlier species ^^ 



Second Contribution to the History of the Vertebrata of the Miocene 



period of the United States 184 



On the Crocodilian genus Perosuchus 203 



Synopsis of the Extinct Batrachia of North America 208 



On Agaphelus, a genus of toothless Cetacea 221 



On some Cretaceous Reptilia 233 



On the Origin of Geuera 242 



Sixth Contribution to the Herpetology of Tropical America 305 



Observations on Reptiles of the Old World, Art. II 316 



Coues, Elliot. A Monograph of the Alcida^ 2 



List of Birds collected in Arizona by D. E. Palmer; with remarks 81 



Lawrence, Geo. N. Description of seven new species of American Birds 



from various localities, with a note on Zonotrichia melanotis.... 359, 429 



Lea, Isaac. Description of nine species of Unionida; from Lake Nicaragua, 



Central America 94 



Description of sixteen new species of the Genus Unio of the United 



States 143 



Notes on some singular forms of Chinese species of Unio 145 



Descriptions of four new species of Exotic Unionidre 150 



Descriptions of seven new species of LTniofrom X. Carolina 160 



Description of two new species of Unionidte from Equador 161 



Descriptions of Unionida? from the Lower Cretaceous Formation of New 



Jersey 162 



LcConte, J. L. Analytical table of the si)ecies of Baridius inhabiting the 



United States 361 



/ S 1 



