Cope.] on [August 20, 



June, 1880, unites Didymictis with Palceonyctis.* Having examined the 

 types of both genera, my conclusion as expressed in the preceding pages 

 is very different. On tlie other hand, I have good reason for believing the 

 species to which the name Synoplotherium was given, S. lanius, is really 

 a second species of Mesonyx, of larger size than the M. obtihsidens, and 

 otherwise different. It is likely that some of the species of the Bridger 

 formation, to which Marsh has applied generic names, belong to the Gre- 

 odonta, and may belong to some of the genera described by myself. The 

 fact that no generic definition accompanied the publication of those names, 

 renders their use impracticable. 



Stated Meeting^ August 20, 1880. 



Present, 4 members. 



President, Mr. Frederick Fraley, in the Chair. 



Mr. Joseph C. Fraley, a newl}^ elected member, was intro- 

 duced, and took his seat. 



Letters of acknowledgment were received from the Royal 

 Society, June 3 (100, 101, 102, 103); the Poyal Society, 

 IsTew South Wales, June 14 (101, 102, 103); Eoyal Institu- 

 tion, July 12 (105); the Victoria Institute, July 10 (105); 

 the Statistical Society, London, July 20 (105) ; Society of 

 Antiquaries, July 21 (105); University Library, Cambridge, 

 July 19 (105) ; the Museum, Newcastle-upon-Tyne, July 19 

 (105) ; New Hampshire Historical Society, August 12 (106 

 and List); New Jersey Historical Society, August 11 (106 

 and List) ; Essex Institute, August 12 (106 and List) ; Bos- 

 ton Public Library, August 14 (106 and List) ; IT. S. Mili- 

 tary Academy, August 13 (106 and List) ; Dr. C. H. 

 F. Peters, Litchfield, A. of Hamilton College, Clinton, 

 Oneida county. New York, August 17 (106 and List) ; 

 American Ethnological Society, New York, August 12 (106 

 and List) ; Connecticut Historical Society, Hartford, August 

 18 (106 and List) ; American Antiquarian Society, Worces- 

 ter, August 13 (106 and List) ; and from Dr. E. Jarvis, 

 Prof. W. P. Blake, Dr. T. M. Drown, and Mr. W. B. 

 Taylor (106 and List). 



*I have just seen this paper, having already written what precedes this 

 paragrapli. 



