92 0. C. Marsh — New Species of Ceratopsia. 



Art. IX. — New Species of Ceratopsia ; by 0. C. Marsh. 



In the series of Ceratopsia remains which I secured in the 

 West for the U. S. Geological Survey, and have since sent to 

 Washington, several forms new to science are represented. 

 One of the skulls, the type of Triceratops elatus, was sent in 

 1891, and with it two others belonging to T. prorsus and T 

 sulcatus, and these are now on exhibition in the National 

 Museum. Among the Ceratopsia skulls, twelve in number, sent 

 to Washington from New Haven during the present month, 

 are two of much interest, both representing new forms. 



Triceratops calicornis, sp. nov. 



One of these, which may be called Triceratops calicornis, is 

 of special importance, as not only the skull but the greater 

 part of the skeleton of the animal is in good preservation, 

 forming one of the most instructive specimens now known of 

 this group of extinct Reptiles. The skull as a whole shows 

 the well-marked features of the genus Triceratops. A specific 

 character is seen in the nasal horn-core, which is in perfect 

 preservation. It is directed well forward, and unlike any 

 hitherto described is concave above, which fact has suggested 

 the specific name. The upper or posterior surface of this 

 horn-core somewhat resembles the bottom of a horse's hoof. 



Some of the principal dimensions of this skull are as follows : 

 Length from front of beak to back of parietal crest, about six 

 feet, five inches ; from front of beak to end of occipital con- 

 dyle, three feet, five inches ; distance from occipital condyle to 

 back of parietal crest, four feet; from front of beak to point 

 of nasal horn-core, twenty-three inches ; height of post-frontal 

 horn-core, twenty-nine and a half inches, and antero-posterior 

 diameter of same horn-core at base, twelve inches. 



Triceratops obtusus, sp. nov. 



A second new species, which may be called Triceratops 

 obtusus, is represented by a large skull belonging to the same 

 genus. The nasal horn-core of this skull is very short and 

 obtuse, and so well preserved that it indicates the normal form 

 and size. The entire length of this horn-core is only one inch. 

 Its summit is three and a half inches behind the premaxillary 

 suture. The width of the nasals beneath the horn-core is five 

 and a half inches. The length of the squamosal from the 

 quadrate groove to the posterior end is about thirty-six inches, 

 and its greatest width is nineteen inches. 



These two skulls were both found by J. B. Hatcher, in the 

 Ceratops beds of Converse County, Wyoming. 



Yale Museum, New Haven, Conn., June 15, 1898. 



