Article XII.— ADDITIONAL CHARACTERS OF THE 

 GREAT HERBIVOROUS DINOSAUR CAMARASAU- 

 RUS. 



By Henry Fairfield Osborn, 



With Thirteen Figures in Text. 



This gigantic reptile was found in the famous Como Bluffs of 

 Wyoming by Dr. J. L. Wortman, of the Museum party of 1897, 

 and Prof. Wilbur C. Knight, of the University of Wyoming. The 

 Museum number is R. 222. The bones include the left ilium, the 

 ischia and pubes of both sides, the right and left femora, the left 

 tibia and astragalus, the right scapula and coracoid, two shattered 

 cervicals, two complete dorsal vertebrae, two incomplete dorsals, 

 three or four incomplete ribs, coalesced spines of three sacral 

 vertebrae and one sacral centrum, twenty caudals and twelve 

 chevron bones. With the exceptions stated, the bones are in a 

 remarkable state of preservation, having been worked out with 

 exceptional skill by Mr. Granger and others, under the direction 

 of Mr. Hermann. 



This is a large individual. The identification is provisional. 

 The measurements, in comparison with those taken from the 

 type of B. excelsns Marsh, are as follows : 



Brontosaurus American Museum 

 excelsns. No. 222. 



Length of femur 5 ft. 9 in. 5 ft. 10 in. 



" " tibia 3 ft. 6 in. 3 ft. Sin. 



" " pubis 3 ft. 10 in. 3 ft. 10 in. 



" " iscliium 3 ft. 8 in. 3 ft. gj^ in. 



" scapula 5 ft. 3 in. 5 ft. 7 in. 



"coracoid 2 ft. ajr^in. 2 ft. sin. 



The new points of greatest importance are : 



First. — The discovery of the hitherto unknown characters of the 

 anterior caudal vertebrae. 



Second. — The apparent resemblances of Cainarasaitrus Cope 

 to Aniphiccelias' Cope, to Brontosaurus Marsh, Atlantosaurus 

 Marsh, and Apatosaurus Marsh. 



•This has been anticipated by Marsh (Am. Jour. Sci., Aug., 1881) in his first classification 

 of tlie Dinnsauria, in which .^ w////c-«'//a.s- is bracketed after CamarasaurHs.,2in& placed in 

 the Atlantosauridcp. In the final classification of the Dinosauria, however (• The Dinosaurs 

 of North America,' p. 241), Cainarasaitrus and Amphiaelias are removed to the Morosauridas. 



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