ABSTRACTS OF PAPERS 209 



111 the absence of the authors, the following papers were read by title : 



METHODS OF STUDYING AMMONITES 

 BY MARJORIE O'CONNELL 



L UNA It PE TREE A C Tl A 8 

 BY E. W. SARDESON 



At noon the Society adjourned. 



Section of Vertebrate Paleontology 



Members interested in vertebrate paleontology formed a separate sec- 

 tion Thursday, at 3.30 p. m., with Dr. W. J. Sinclair presiding. 



presentation of papers 



In the first paper of the session Dr. Troxell summarized briefly the few 

 discoveries of dinosaurs, aside from footprints, that had been made in the 

 Newark sandstones of the Connecticut Valley, with additional data of 

 the circumstances of each discovery secured by him in field-work last 

 summer, and showed certain problematic fossils which he had found. 



FOSSILS OF THE CONNECTICUT VALLEY 

 BY EDWAED L. TROXELL 



(Abstract) 



About a dozen specimens of reptiles have been found in the Newark series 

 of New England, showing that they are remarkably rare as compared to the 

 number and variety of the footprints ; none of those known are large enough 

 to have made certain of the footprints, which measure 20 inches in length. 



A search during the summer resulted in the finding of one or more undoubted 

 bone fragments of the smaller Anchisaurus, and other fragments which are 

 doubtfully referred to the larger reptiles. Other interesting material was 

 found : silicified and carbonized wood, Unio shells of a new variety, footprints 

 in a new locality, and fish from the well known black shales. 



HYRACODONS FROM THE BIG BADLANDS OF SOUTH DAKOTA 



BY W. J. SINCLAIR 



(Abstract) 



Comparison of a large series of dentitions from the various levels of the 

 White River enabled the author to determine certain characters, especially in 

 the premolars, as constant and valid specific distinctions. Size was found to 



XIV— Bull. Geol. Soc. Am., Vol. 33, 1921 



