204 PROCEEDINGS OF THE ACADEMY OF 



Sept. \st. 

 The President, Dr. Hays, in the Chair, 

 Twenty-two members present. 



Sept. Sth. 

 The President, Dr. Hays, in the Chair. 

 Twenty-eight members present. 



Sejit. 15th. 

 The President, Dr. Hays, in the Chair. 



Twenty-eight members present. 



The following papers were presented for publication : 



Extinct Mammalia of Dakota and Nebraska, including an account 

 of some allied forms from other localities, together with a synopsis of 

 the Mammalian Remains of North America. Illustrated by twenty- 

 eight plates. By Joseph Leidy, M. D. Preceded by an introduc- 

 tion on the Geology of the Tertiary Formations of Dakota and 

 Nebraska, accompanied by a Map. By F. V. Hayden, M. D. 



Notice of American Species of Ptychodus. By Joseph Leidy, 

 M. D. 



Synopsis of the Extinct Batrachia of North America. By Edw. 

 D. Cope. 



Dr. Leidy read a letter from Mr. B. Waterhouse Hawkins, pro- 

 posing to erect in the Museum, at his own expense, the fossil remains 

 of the Hadrosaurus to their natural relations in the figure of that 

 great Dinosaur, in accordance with Dr. Leidy's descriptions in his 

 Monograph of the Cretaceous Reptiles of the United States. 



On leave being granted, the following resolutions, offered by Dr. 

 J. L. LeConte, were adopted : 



That the Academy accept the proposition of Mr. B. Waterhouse 

 Hawkins, to erect in this Hall, at his own expense, a restoration of 

 the skeleton Hadrosaurus. 



That the thanks of the Academy be respectfully tendered to Mr. 

 Hawkins for his liberal offer, and that the Curators be instructed to 

 furnish to him every facility in the use of specimens in the Museum, 

 which the most liberal interpretration of the By-Laws will permit. 



Sept. 22d. 

 Dr. Bridges, in the Chair. 

 Twenty-four members present. 



Se2)t. 2dth. 

 The President, Dr. Hays, in the Chair. 

 Twenty-four members present. 



[Sept. 



