BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 30, pp. 379-388 September 30, 1919 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



CAMAEASAUEUS, AMPHICOELIAS, AND OTHEE SAUEOPODS 



OF COPE^ 



BY HEN-RY FAIRFIELD OSBORN" AXD CHARLES CRAIG MOOK 



(Presented before the Paleontological Society December 29, 1918) 



CONTENTS * 



Page 



Introductiou 379 



Occurrence and collecting of material 380 



Original discovery and collecting 380 



Subsequent collecting 380 



Geological description of the Canyon City dinosaur locality 381 



The quarries 382 



Original descriptions of Opisthoccelia by Cope 382 



Preparation and research in the American Museum 383 



Acquisition 383 



Research in 1904 383 



Research in 1912-1919 384 



Carnivorous dinosaur material and types 385 



Characters of the genus Camarasaurus 385 



Synonomy of Camarasaurus Cope and Morosaurus Marsh 386 



Characters of the genus Amphicoelias 387 



IXTRODUCTIOX 



In 1902 the Cope Collection of Fossil Eeptiles was presented to the 

 American Museum of Natural History by President Morris K. Jesnp. 

 It included all of Cope's types and other dinosaur material of Morrison 

 age from the vicinity of Canyon Cit}", Colorado. Several of these types 

 antedated in definition Marsh's types from beds of similar age. Cope's 

 references were full, but accompanied by few figures ; Marsh's came later 

 and were adequately illustrated. Marsh also issued, in the publications 

 of the United States Geological Survey, two more or less complete sum- 



1 Manuscript received by the Secretary of the Society March 12, 1019. 

 Henry Fairfield Osborn and Charles Craig Mook : Introduction to a joint memoir en- 

 titled "Camarasaurus, Amphicalias, and other sauropods of Cope." In preparation. 

 American Museum of Natural History. 



(379) 



