6 A REVISION OF THE COTYLOSAURIA OF NORTH AMERICA 



paper on the same subject indie same year (40) adds certain tacts, but proposes no 

 change in the classification. 



In 1896 also appeared the "Primary Factors of Organic Evolution" (42), in 

 which Cope again located the Cotylosauna as the most primitive group of the reptilia. 



In " Science" for May 7, 1896, Baur (2) published a discussion of Sclerosaurus 

 armatus H. v. Meyer, from the Triassic of Germany. He used the caption 

 Pareiasauria Seeley (Cotylosauna Cope). In private conversation with the author 

 he asserted that because Cope gave up the order Cotylosauria established on the 

 supposed double occipital articulation with the vertebral column and reestablished it 

 on the characters given by Seeley for his Pareiasauria the name Cotylosauria should 

 be dropped and the name Pareiasauria used. 



In 1898, after Cope's death, appeared his revised "Syllabus of Lectures on the 

 Vertebrata" (44), in which the family Otoccelidce is separated from the Cotylosauria 

 and placed in a new order, Chelydosauria. 



In 1900 the United States National Museum published Cope's "Catalogue of 

 the Crocodilians, Lizards, and Snakes of North America" (45), in which the same 

 classification appears as in the last edition of his syllabus of lectures. 



In the same year Hay's "Bibliography and Catalogue of the Fossil Vertebrates 

 of North America" appeared as a bulletin of the United States Geological Survey 

 (47). In this the Cotylosauria is considered as a distinct order with the families 

 Pariotichidce, Diadectidce, and Pareiasaurtdce. 



In 1902 Eastman's translation of Zittel's "Grundzuge der Paleontologie" (71) 



gave 



Order Theromorpha (Anomodontia Seeley non Owen). 



Suborder I. Pareiasauria Seeley (Cotylosauria Cope). 

 Family Pareiasaurtdce. 

 Pariotichidce. 

 Diadectidce. 



On December 29, 1902, Osborn and McGregor read a paper before the Ameri- 

 can Association for the Advancement of Science at the Washington meeting; the 

 same paper was read before the New York Academy of Science on February 9, 1903. 

 An abstract of this paper was published in " Science" for February 13, 1903 (54), by 

 Osborn. In it was proposed the division of the Class Reptilia into two subclasses, 

 the Diapsida and Synapstda. 



Subclass Synapsida. Subclass Diapsida. 



Order Cotylosauria. Order Rhyncocephalia. 



Anomodontia. Dinosauna. 



Testudinata. Icthyosauria. 



Plesiosauria. Phytosauria. 



Pterosauria. 

 Squamata. 

 Crocodtha. 

 In the same year Broom (8) proposed a division of the primitive Reptilia as 



follows : 



Rhyncocephaloid Orders. Theromorous Orders. 



Order Procolophonia. Order Pareiasauria. 



Pelycosauria. Theriodontia. 



Anomodontia. 



