CERATOPS ALTICORNIS. 



115 



GENERA AND SPECIES DESCRIBED BY MARSH AND HATCHER, CHIEFLY FROM CONVERSE 



COUNTY, WYO. 



I will next consider those representatives of the larger and more specialized members of 

 the Ceratopsidse made known by Professor Marsh. The greater portion of these were obtained 

 by me from the Laramie deposits of Converse County in central eastern Wyoming. A few, 

 however, are from the Denver beds, in the vicinity of Denver, Colo., and were collected by 

 Messrs. Whitman Cross, G. H. Eldridge, and George L. Cannon. 



CERATOPS Marsh. 1888. 

 Ceratops alticornis Marsh. 1889. 



Syn., Bison alticornis Marsh. Transferred to genus Ceratops, Am. Jour. Sei., vol. 38, Aug., 1889, pp. 174-175, 

 Type consists of supraorbital horn cores (No. 1871 E, U. S. National Museum) from Denver beds, Colorado. 

 Original description in Am. Jour. Sci., vol. 34, Oct., 1887, pp. 323-324. 



Marsh, O. C, Am. Jour. Sci., vol. 38, 1889, pp. 174-175; Mon. U. S. Geol. Survey, vol. 27, 1897, pp. 512, 527, 



Osborn, H. F., Contr. Canadian Pal., vol. 3 (quarto), pt. 2, 1902, pp. 9, 14. 



Walcott, C. D., Science, new ser., vol. 11, 1900, p. 23. 



Fig. 106.— 1, Part of skull with horn cores of Triceratops (Ceratops. Bison) alticornis Marsh, front view; 2, the same specimen, seen from 



the left. Both figures are one-eighth natural size. After Marsh. 



The earliest of these largest forms of the Ceratopsidse to be described by Professor Marsh 

 was the type of the present species. This comprised a portion of the cranium consisting for 

 the most part of the pair of frontal horn cores shown in fig. 106. Owing to the very close 

 resemblance between these horn cores and those of certain members of the Bovida?, and more 

 especially of some of the extinct bisons, Professor Marsh quite naturally overlooked their real 

 nature, and in his first description he referred them to the genus Bison, making them the type 

 of the new species alticornis. His original description, as published in the American Journal of 

 Science of October, 1887, was as follows: 



This species of Bison is represented by various remains, the most important of which is the portion of a skull figured 

 below. This specimen, which may be regarded as the type, indicates one of the largest of American bovines, and one differing 



