CERATOPS. 



103 



Ceratops paucidens Marsh. 1889. 



Type consists of left maxillary and a premaxillary (in U. S. National Museum), Judith River beds, Dog Creek, 



Montana. 

 Originally described as Hadrosaurus paucidens in Am. Jour. Sci., 3d ser., vol. 37, Apr., 1889, p. 336. Later placed in the 

 genus Ceratops (Am. Jour. Sci., 3d ser., vol. 39, Jan., 1S90, p. 83). 

 Nopcsa, F. Baron, Foldtani Kozlony, Budapest, 1901, vol. 31, p. 270. 



The type of this species (now in the U. S. National Museum), a left maxillary and a 

 premaxillary, was found by the present writer in the upper Judith River beds, on Dog Creek, 

 Montana. The exact locality was on the western slope, very near the summit, of a rounded 

 badland hill about 20 rods east 

 of the spring situated about 

 one-quarter of a mile east of 

 the freight road running from 

 Judith to Maiden, Mont. The 

 locality is locally known as the 

 "Bad Place" by freighters, 

 having acquired this name from 

 the nature of the road, which 

 here follows the winding divide 

 between Dog Creek and the 

 Judith River. The divide at 

 this place is both narrow and 

 crooked. It is inclosed on 

 either side by badlands which 

 extend on either side to the 

 neighboring streams. It is dis- 

 tant about 12 miles from Judith 

 post-office, on the Missouri 

 River, and, on account of the 

 spring mentioned above, dur- 

 ing certain seasons of the year 

 the locality is a favorite camp- 

 ing place for freighters bound 

 to and from either Judith or 

 Big Sand) r , a station on the 

 Great Northern Railway. 



In his original description" 1 

 Professor Marsh referred this 

 species to the genus Hadrosau- 

 rus; the year following, how- 

 ever, he placed it in the genus 

 Ceratops. His original descrip- 

 tion is as follows: 



In strong contrast with the species above described (Hadrosaurus breviceps) is another from the same region and same 

 formation. The best preserved specimen that now represents it is a left maxillary, nearly complete. With this was found 

 some other portions of the skull, but the maxillary affords the best distinctive characters. All, however, indicate a skull of 

 extreme lightness and delicacy of build for one of the Ornithopoda. The maxillary is especially slender, and the anterior 

 and posterior extremities are pointed. The middle of the bone is more massive, but yet very light for this portion of the skull. 

 The teeth are of the general type of those in this genus, but are comparatively few in number and only one row appears to 

 have been in service. 



The maxillary preserved is about 10 inches in length, and 3 inches high near the center. The row of teeth in use contains 

 about thirty. 



The remains on which the present species is based were found in 1888, in the Laramie formation of Montana, by Mr. J. B. 

 Hatcher, of the United States Geological Survey. 



Fig. 104.— 1, Supraorbital horn core and occipital condyle of type (No. 2411, U. S. National 

 Museum) of Ceratops montanus Marsh, side view: a, Horn core; b, condyle. 2, Posterior 

 views of occipital condyle and supraorbital horn cores of same: a, Left horn core; c, 

 right; 0, condyle. One-fourth natural size. After Marsh. 



«Am. Jour. Sci., vol. 37, 



9, p. 36. 



