CONTENTS IX 



Page 

 Systematic description of genera and species ' 4 



Family Protoceratopsidae ' 



74 

 Genus Protoceratops 



Protoceratops andrewsi ' 



7R 

 Genus Leptoceratops 



Leptoceratops gracilis '° 



Q 1 



Family Ceratopsidae 



Genus Monoclones (Judith River phase) 



8? 

 Monoclonius crassus oi 



Monoclonius recurvicornis °-> 



0-2 



Monoclonius sphenocerus 



i 8^ 



Monoclonius dawsoni 



Sub-genus Centrosaurus (Belly River phase) 



Monoclonius (Centrosaurus) apertus 



Monoclonius (Centrosaurus) flexus 



Monoclonius (Centrosaurus) nasicornus 



Monoclonius (Centrosaurus) cutleri 



87 

 Genus Styracosaurus 



• 87 



Styracosaurus albertensis 



90 

 Styracosaurus ovatus 



Genus Eoceratops 



Eoceratops canadensis 



92 

 Genus Chasmosaurus 



Chasmosaurus belli 



94" 

 Chasmosaurus brevirostns 



94 

 Chasmosaurus kaiseni 



96 



Genus Ceratops 



^ .... 96 



Ceratops montanus 



97 

 Genus Brachyceratops 



Brachyceratops montanensis 



A .. 102 



Genus Anchiceratops 



Anchiceratops ornatus 



• i ()4 



Anchiceratops longirostris 



a • • 106 



Genus Arrhinoceratops 



Arrhinoceratops brachyops 



108 



Genus Pentaceratops 



Pentaceratops sternbergii 



Pentaceratops fenestratus 



^ • 11 + 



Genus Triceratops 



Triceratops horridus 



Triceratops prorsus 



Triceratops brevicornus 



Triceratops serratus 



