NO. 2260. ^-EW RESTORATION OF TRWERATOPS—GILMORE. 99 



and it now places the type on an adequate foundation for comparison 

 with the other and better known species. 



Although somewhat distorted latterly by pressure the skull is 

 essentially complete, lacking only the rostral, premaxillary bones, and 

 the median portion of the frill or demosupraoccipital. 



That the skull belongs to the same individual as the type is shown 

 by the similarity of the labels accompanying both, by the unusual 

 bright yellowish color of the bones and also by the finding of frag- 

 ments with the skull that fitted the dentaries, and fragments with the 

 nasals and dentaries that were fitted to the skull. 



The original description by Professor Marsh and the more recent 

 description by Hatcher are given in their entirety below : 



Professor Marsh described this species as follows : 



A second new species, which may be called Triceratops ohtusus, 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 1 inch. Its summit 

 is Si inches behind the premaxillary suture. The width of the nasals beneath 

 the horn core is 5^ inches. The length of the squamosal from the quadrate 

 groove to the posterior end is about 36 inches and its greatest width is 19 inches. 



These two skulls [types of T. calicornis and T. obtusus] were both found by 

 J. B. Hatcher in the Ceratops beds of Converse [Niobrara] County, Wyo. 



Hatcher redescribes the specimens in the following : 



The type (No. 4720, U. S. National Museum) of the present species consists 

 of a pair of mandibular dentaries and the anterior portion of the nasals, a left 

 maxillary, a squamosal, parts of pterygoid, and a vertebra. The specific name 

 was suggested by the nasal horn core. The nasals, as shown in the accompany- 

 ing figures, are extremely broad, and the nasal horn core is reduced to a broad, 

 rounded, and rugose prominence, marked with a number of deep vascular 

 grooves. 



The dentary is exceptionally deep and the teeth are unusually large. Below 

 the base of the coronoid process on either dentary the external surface of the 

 bone presents a very sharp ridge that extends continuously throughout about 

 one-third of its length. The posterior portion of the alveolar region of the left 

 dentary bears evidence of having been affected by disease and presents extensive 

 malformations. The mandibular fossa extends rather farther forward than is 

 common in other species of the Ceratopsia. The dentary is exceptionally mas- 

 sive and the teeth are very large. There are a number of foramina on the 

 external surface of the dentary, as shown in the accompanying figure. 



Notwithstanding the scanty and fragmentary material upon which the present 

 species is based, it would seem to be a valid one, as indicated alike by the 

 characters of the dentary, the teeth, the nasal horn core, and that part of the 

 nasals still preserved. 



The type of tlie present species was found in Converse [Niobrara] County, 

 AVyo., about 1 mile east of Lance Creek and 2 miles southeast of the U-L ranch. 

 The horizon would be about the middle of Laramie [Lance], as those deposits 

 are represented in this region. The locality is shown at +9, PI. LI. 



