EOCERATOPS CANADENSIS. 
IS 
Eoceratops to Triceratops. (Plates II and V.) 
Large brow-horn increasing in size. 
Nasal horn persistently small. 
Squamosal broadly triangular. 
Parietal fontanelle disappearing (closing). 
Centrosaurus, Styracosaurus, and Brachyceratops. 
(Plates III and VI.) 
Brow-horn persistently small. 
Nasal horn persistently large. 
Squamosal continuing small. 
Parietal fontanelle diminishing. 
Chasmosaurus to Torosaurus. (Plates IV and VII.) 
Brow-horn increasing. 
Nasal horn decreasing. 
Squamosal lengthening. 
Parietal fontanelle diminishing. 
The more salient characters of the skull in the best known 
genera of homed dinosaurs may be briefly tabulated as follows:— 
