ART. 3. THE SMALLEST HOENED DII^OSAUR GILMORE. 3 



individual parts. However, this is hardly noticeable except as one 

 makes a critical examination of this portion of the skeleton. 



The missing bones have been restored largely, as in the case of the 

 humeri both of which were gone, from the homologous bones of 

 Monoclonius. The restored portions have been given a distinctive 

 color which at once distinguishes them from the original parts, as 

 is well shown in the illustrations in plates 1 and 2. 



The bones used in this composite mount are catalogued as follows : 



Skull and lower jaw No. 7951 



Vertebral centra and processe.s No. 7953? 



Sacrum and complete caudal series No. 7953 



Complete pelvis No. 7953 



Femora No. 7953 



Ribs No. 7953? 



Scapula, left No. 795S 



Ulna, left No. 8076 



Radius Nos. 8077, 807S 



Bones of left forefoot No. 8079 



Fibula, tibia, and left hind foot . No. 7957 



The small size of Brachijcerafops is strikinaly brought out by com- 

 parison with the Triceratojjs^ as shown in plate 3, where, as may be 

 seen, the length of the entire skeleton is less than that of the skull 

 of the larger animal, but the proportions of the two are remarkably 

 similar. In each the slaill is about one-third the length of the 

 entire animal; in the extreme shortness of the body, the deep 

 thoracic cavity, and in other peculiarities they are essentially simi- 

 lar, though representing the two extremes of their race. 



A life restoration of BracKycerato'ps, modeled one-sixth natural 

 size and based on the materials forming the composite specimen, is 

 shown in plate 4. The pose is very similar to that adopted for the 

 skeleton. "While it will probably be found to be incorrect in some 

 respects, it at least gives some idea of the life appearance of the 

 animal. The attempt is here made for the first time to depict the 

 character of the scaled skin. That the horned dinosaurs had a 

 scaled integumentary covering is now well known from several 

 specimens discovered in the Belly Rivor formation, Upper Cretaceous 

 of western Canada, Some of these specimens had considerable areas 

 of skin impression preserved and though the patterns differ in the 

 several species, those adopted for Br achy cer atop s may be considered 

 tentative until the discovery of actual impressions shall disclose their 

 true nature. 



EXPLANATION OF PLATES. 



Plate L 



Lateral view of the mounted skeleton of Brachyceratops montanensis Gilmore 

 In the U. S. National Museum. Viewed from the left side. About tV natural 

 size. Restored portions indicated by the light-colored areas. 



