^70 THE CANADIAN NATURALIST. [Vol. vii. 



M 

 «remains of numerous individuals of the above character, which 



included among other portions crania in a moderately good state 

 of preservation. Most of these skulls are nearly or quite three 

 ^eet in length, and mostly deprived of their mandibular portions ; 

 these are quite abundant in a separated condition. The crania 

 represent at least three species, while the mandible presents a 

 vcondition distinct from that of Titanotherium or any allied genus. 

 The teeth diminish rapidly in size anteriorly, and there is no dis- 

 ^stema behind the canines, whose conic crowns do not exceed those 

 of the premolars in length. To the genus and species thus charac 

 terized I have elsewhere given the name of Symhorodon torvus. 



One of the crania, referred to under the name of Miohasileus 

 -ophagus, is characterized by its strong and convex nasal bones 

 and concave superior outline posteriorily, and by the presence of 

 a massive horn-core on each side of the front whose outer face is 

 continuous with the inner wall of the orbit, precisely as in the 

 Loxolophodon cornutus. It stood above the eye in life, and 

 diverged from its fellow so as to overhang it. In the specimen, 

 which was fully adult, they were worn obtuse by use — length, 

 about eight inches; thickness, three inches. The molar teeth 

 ^iiflfer from those of Titanotheriura Proutii in having cross crests 

 extending inward from the apices of the outer chevrons, each of 

 ■which dilates into a T-shape near the cones. 



The third species is for the present referred to Megaceratops, 

 vunder the name o^ M. acer. It has overhanging eye-brows and 

 ithe vertex little concave, but the nasal bones are greatly strength- 

 »ened, and support on each side near the apex a large curved 

 ^iiorn core of ten inches in length with sharply compressed apex. 

 These bones diverge with an outward and backward curve, and 

 when covered with their sheaths must have considerably exceeded 

 a foot in length. This was a truly formidable monster, consider- 

 ably exceeding the Indian rhinoceros in size. 



The fourth species is allied to the last, and has well developed 

 superciliary crests without horns. The latter are situated well 

 anteriorly, and are short tubercles not more than three inches ia 

 height. They are directed outward, and have a truncate ex- 

 tremity. The type individual is of rather larger size than those 

 of the other species. There are several crania referable to the 

 three now named. The present one has been named Megacera- 

 4ops hiloceros. 



It was thought probable that some of the species based upon 

 crania would be found to belons to the genus Sumhorodon. 



