ABSTRACTS OF PAPERS 131 



althougli he touched on and disposed of the recent criticisms of Eev. 

 H. W. Hutchinson. 



At 11.30 the Society commenced again in general session to continue 

 the reading of papers, with Doctor Merriam presiding. The chairman 

 announced that, in order to give variety to the program, papers from the 

 three branches of paleontology would be interspersed. The first paper 

 was a paleobotanic one, illustrated with specimens. Discussed by Messrs. 

 Holland, Williston, Merriam, and Yaughan. 



CRITICAL ^TVDY OF FOSSIL LEAVES FROM THE DAKOTA SANDSTONE 



BY E. M. GRESS* 



(Abstract) 



The study has been based on a collection consisting of about 100 specimens. 

 About 80 of these are from a large collection of fossils purchased from Baron 

 Ernst de Bayet, of Brussels, a few years ago, the remainder from the United 

 States National Museum by exchange. The Bayet collection comes from Ells- 

 worth County, Kansas ; the others from different parts of Kansas and Nebraska. 



A few of the specimens had already been identified, some by Leo Lesquereux ; 

 others by an unknown person. ]Most of them bore no record of identification. 

 All specimens have been carefully examined, and those bearing no labels have 

 been Identified, while those already Identified have been verified. 



The collection is represented by about 65 species and 25 genera, among which 

 the most common are the following : Aralla, Betulites, Ficus, Magnolia, Po]iu- 

 lus, Protophyllum, Sassafras, Sterculla, and Viburnum. 



In our study of the fossils we have included a brief review of the history, 

 location, and correlation of the "Dakota Formation." with a careful description 

 of each species and citations of available references. A critical study and com- 

 parison of each specimen with other described and figured species and with 

 type forms has been made. 



Professor Osborn then presented liis interesting papers on vertebrate 

 paleontology, botli of which were illustrated by lantern slides. In the 

 discussion of these papers Messrs. Holland, Merriam, Peterson, Granger, 

 and Matthew toolc part. 



OBSERVATIONS ON THE SKELETONS OF MOROPUS COOKI IN THE AMERICAN 



MUSEUM 



BY HENRY FAIRFIELD OSBORN 



( Abstract) 



Moropus is the largest and most distinctive mammal of Lower Miocene time 

 in western North America, and has attracted a great deal of attention from 



Tntroducpfl by O. E. .Tenninss. 



