XXVI LIFE AND WORKS OF COPE. 



ings of the American Philosophical Society give much new 

 evidence about this very interesting group. The titles of 

 these papers are : "The Reptilian Order Cotylosauria" * and 

 Second Contribution to the History of the Cotylosauria." t In 

 this paper a new family, Otocoelidse, was described with the 

 following characters : Posterior border of temporal roof ex- 

 cavated laterally by the meatus auditorius externus. Teeth 

 present in a single row, not transversely expanded. Ribs 

 immediately overlaid by parallel transverse derm-ossifica- 

 tions which form a carapace. This family he considered, 

 or at least suggested was, ancestral to the Chelonia. 



Cope had in preparation for many years an extensive 

 work on the Lacertilia and Ophidia of the United States, to 

 be published, like his Batrachia, in a bulletin of the United 

 States National Museum. J The MSS. for this work cost him 

 much labor, especially during the last two years of his life 

 and for a while interrupted all his other work. It was 

 characteristic of him to turn aside for a laborious detailed 

 investigation upon the soft anatomy of the snakes in the 

 hopes of finding some satisfactory means of classifying this 

 puzzling group from the structure of the copulatory or- 

 gans. This investigation constituted his latest original 

 work and was barely completed before his death. 



Evolution and Classification of the Mammalia. 



Up to 1868 Leidy held the Western paleontological field 

 exclusively. In this year Marsh and Cope also entered the 



*Proc. Am. Philoc Soc, Vol. XXXIV, 1896 (Feb. 2d), pp. 436-457, Pis. VII-X. 



tibid., Vol. XXXV, pp. 112-139, Pis. VII-X, Aug. 15, 1896. 



{Many preliminary papers have appeared for this publication, of which the 

 following are named : 



" An analytical Table of the Genera of Snakes." Proc. Am. Philos. Soc, 1886 pp 

 479-499 



" The Osteology of the Lacertilia." Proc. Am. Philos. Soc, Vol. XXX, 1892, pp. 

 185-221. Pis. II- VI. < 'ff 



"On Degenerate Types of Scapular and Pelvic Arches in the Lacertilia." Journ. 

 Morphol., Vol. VII, 1892, pp. 233-2-14, PI. XIII. 



"The Classification of the Ophidia." Trans. Amer. Philos. Soc, Vol. XVIII. 

 April 15, 1895, pp. 186-219, Pis. XIV-XXXIII. 



" On the Hemipenes of the Sauria." Proc. Acad. Nat. Sci., Phil., August. 1896, 

 pp. 461-467. . . B . 



