CERATOPSIAJSr DINOSAURS FROM MONTANA — GILMORE 



13 



were no epoccipital bones developed on the frill of Braxihycerato'ps, 

 these processes being direct outgrowths of the frill itself. There is 

 no indication of sutural contact, and were these processes separate 

 ossifications as in Triceratops^ Pentaceratops, and many other cera- 

 topsian genera, there would be evidence of their union, since all other 

 sutural contacts of the skull are plainly visible. 



FiGUKB 10. — Interparietal? of Brachyceratops montanensis (U.S.N. M. No. 14765) 

 from above. One-seventh natural size. 



Viewed 



Hatcher ^ has pointed out that in Monoclonius "they [the epoccip- 

 itals] are not derived from separate centers of ossification, as are 

 the epoccipitals in THceratops^ but are present even in young indi- 

 viduals, firmly attached to and forming a part of the squamosals and 

 parietals." That he was mistaken in this conclusion is shown by 



» U. S. Geol. Surv. Monogr. 49, p. 19, 1907. 



