XXIV LIFE AND WOEKS OF COPE. 



the long-tailed Ratitce (ostrich, etc.), he was unable to indicate." 

 (Proc. Acad. Nat. Sci., Philadelphia, Vol. XIX, 1867, pp. 234-5.) 



Huxley's paper upon the same subject appeared in 1868.* 

 In 1870 Cope read an important paper before the Ameri- 

 can Association " On the homologies of some of the Cranial 

 Bones of the Reptilia and the systematic arrangement of the 

 ctos."t He discussed the following topics : 1. Homolo- 

 gies and Composition of the cranial arches. 2. The crani- 

 um of the Ichthyosauria. 3. The cranium of the Anomo- 

 dontia. 4. The homologies of the opisthotic. 5. The 

 squamosal bone. 6. The columella (epipterygoid). 7. The 

 systematic arrangement of the Reptilia. 8. Critical re- 

 marks on the system. 9. The Ehynchocephalia and sup- 

 posed Lacertilia of the Trias and Permian. 10. Strati- 

 graphic relation of the orders of Reptilia. 



His classification is as follows : 



A. Extremities beyond proximal segment not differentiated 

 as to form. 



I. Ichthyopttrygia : Order Ichthyopterygia. 



B. Extremities differentiated. 



II. Streptostylica : Orders Lacertilia, Pythonomorpha, 

 Ophidia. 



III. Synaptosauria : Orders Rhynchocephalia, Testudi- 

 nata, Sauropterygia. 



IV. Archosauria : Orders Anomodontia, Dinosauria, 

 Grocodilia, Ornithosauria. 



In 1875 the large volume " 21ie Vertebrataof the Cretace- 

 ous Formatio7is of the West " appeared, as Vol. II of the 

 Rep. U. S. Geol. Surv. Territ. (302 pp., PI. LVII.). This 

 work contains extensive descriptions, especially of the 



♦Popular Science Review, 1868, pp. 237-247. 

 tProe. Assoc. Adv. Sci., XIX, pp. 191-247. 



