EOCERATOP3 CANADENSIS. 
21 
Reference may here be made to the opinion expressed by 
Mr. Brown in a recent paper that Centrosaurus apertus is a 
synonym of Braekyceratops 1 dawsoni. 
The known characters of B. dawsoni — large backwardly 
curved nasal horn-core, incipient supraorbital horn-cores (as in 
Styracosaurus), small squamosals, a smooth undulating free 
border to the frill without epoccipitals, and greatly reduced 
openings in the frill, if indeed they were present at all — are in 
marked contrast to and greatly at variance with the fully known 
ones of Centrosaurus a genus established by the writer eleven 
years ago 2 for the reception of a well preserved neck-frill dis- 
covered by him in 1901 in the Belly River beds of Red Deer 
river about one mile below the mouth of Berry creek. Ad- 
ditional Centrosaurus material in the possession of the Geological 
Survey, from the same locality and horizon, including skulls of 
which one has the lower jaw in place (Plate VI, figure 1, and 
Plate XI) fully confirms the early descriptions, reveals the full 
osteology of the skull, and further demonstrates the distinctness 
of the genus and species among the homed dinosaurs of the Belly 
River Cretaceous. Mr. Brown in the paper here referred to 
has proposed the specific name fiexus for a skull of Centrosaurus 
apertus from the same beds on Red Deer from which the original 
neck-frill (type) and the supplementary specimens come. The 
skull described by Mr. Brown was found by the American 
Museum party in 1912 one mile below the mouth of Berry creek 
and presumably not far distant from where the type specimen 
of Centrosaurus was discovered. 
There seems to have been a tendency in the homed dinosaurs 
to produce a separate bony growth on each prominence of the 
upper part of the skull. Thus the epoccipitals occur in a series 
along the free border of the frill, one to each convexity, and 
the epijugal is so named from its situation at the lower extremity 
of the jugal. Recently Dr. C. W. Gilmore has found in the type 
of Brachyceratops (Plate VI, figure 3, and Plate X) an ossicle 
1 Bull. Amer. Mus. Nat. Hist., Vol. XXXIII, art. XXXIV, pp. 549-558, 
1904. 
s Ottawa Naturalist, Vol. XVIII, pp. 81-84, 1904; and Trans. Royal 
Soc. of Canada, second series, Vol. X, pp. 3-9, 1904, 
