114 



THE CERATOPSIA 



Dimensions of Skeleton B 



Length of left dentary 530 mm. 



Length of entire vertebral column, as preserved 4100 



Total length of the nine cervicals 820 



Length of thoracic region 880 



Length of sacrum 840 



Total length of caudals, as preserved 1560 



Length of first three coalesced cervicals 300 



Greatest breadth of sacrum 610 



Length of left half of shoulder girdle, measured over the curve 1000 



Length of left coracoid 250 



Length of scapula 730 



Length of right humerus 646 



Greatest proximal breadth of same 277 



Length of radius 434 



Length of ulna 577 



Length of ilium 1120 



Length of ischium, measured on curve 1000 



Length of left femur 880 



Length of left tibia, inclusive of astragalus 655 



Length of left fibula, inclusive of calcaneum 600 



Breadth of calcaneum 80 



Genus TRICERATOPS Marsh 57 



As a result of the labors of Mr. Hatcher and his aides, no fewer than thirty-two ceratopsian 

 skulls, more or less complete, were found in the Lance formation of Niobrara County, Wyoming. 

 These include the type of nearly every Triceratofs and both of the Torosaurus species. Circum- 

 stances were such that the skulls of the upper levels were the best preserved, so that with the excep- 

 tion of Triceratofs horridus and Triceratofs obtusus, which are the lowest in the series, most of the 

 types come from the upper portion and are all quite near one another stratigraphically. Based 

 upon all the available data, the skulls have been arranged in their stratigraphic sequence as follows: 58 



"Marsh, O. C, 1889, B, p. 173. 

 58 Lull, R. S., 1915, p. 343. 



