THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XLI. — Two New Ceratopsia from the Laramie of 

 Converse County, Wyoming • by J. B. Hatcher. (With 

 Plates XII, XIII.) 



[From a Monograph on the Ceratopsia by J. B. Hatcher. Published by 

 permission of the Director of the U. S. Geological Survey.] 



Editorial note. — In the course of his extensive study of the 

 Laramie Ceratopsia contained in the U. S. National Museum 

 and in that of Yale University, Mr. Hatcher discovered two 

 forms which, were new to science. These he described in the 

 above mentioned monograph, giving to the first, an undoubted 

 Triceratops, a new specific name, while for the second speci- 

 men, which represents a new genus as well as species, no name 

 was suggested by the author. The duty of naming this form 

 devolves therefore upon the editor. The generic name Dicera- 

 tops is suggested by the lack of a nasal horn, while the specific 

 name hatcheri will serve to commemorate Mr. Hatcher's work 

 in connection with this remarkable type. 



In view of the recent discoveries among these most interest- 

 ing forms, it has been deemed advisable to publish these descrip- 

 tions at the present time without waiting for the publication 

 of the monograph. — Richard S. Lull. 



Triceratops brevicornus sp. nov. 

 Plate XII, Figures 1 and 2. 

 Type No. 1834, Yale Museum. 

 Char. Specific: Supraorbital horn cores short and stout, not much com- 

 pressed, nearly circular in cross- section. Nasal horn core short and 

 stout with the anterior border vertical instead of being directed upward 

 and forward at an angle of 30 degrees. Vertical and longitudinal 

 diameters of lateral temporal foramen nearly equal. Orbit irregularly 

 elliptical in outline with the longer axis running from above downward, 

 and forward. Postfrontal fontanelle open even in old individuals. 



The type. Xo. 1834, Yale Museum, of the present species 

 consists of a nearly perfect skull with lower jaw and a com- 



Am. Jour. Scl— Fourth Series, Vol. XX, No. 120. — December, 1905. 

 29 



