66 



of size, to the specimen figured by Dr. Leidy. (Cont. to Ex- 

 tinct Vert. Fauna, Plate XXVI., Fig. i.) 



The Squamosals are large and heavy, but encroach little 

 upon the temporal fossae ; they are situated directly below 

 the large parietal projections. The glenoid cavity is trans- 

 verse and straight in this direction, broad and shallow, with 

 no internal process ; and the post-glenoid process is long and 

 massive. The zygomatic process is short, stout, high, and 

 trihedral, with a strongly arched upper margin. The articu- 

 lation with the malar is by a straight, flat face, and anchylosis 

 of the two never takes place. The anterior termination is 

 pointed, and the outer margin is rounded. 



The Malars form none of the face. They are long, 

 slender, curved downwards and backwards, and but little 

 outwards. They are longer, straighter, and less curved out- 

 wards than in either LoxolopJiodon or Dinoceras ; they do not 

 present the sharp angle in the lower margin shown in the 

 latter genus, nor are they so extensively overlapped by the 

 zygomatic processes of the squamosal. Posterior to the 

 molar series, the malars are greatly compressed and very 

 slender, but at the junction with the maxillaries they become 

 much wider and thicker. There is no trace of a postorbital 

 process ; and the projections from the under surface of the 

 bone at their junction with the squamosals, so prominent in 

 Dinoceras, are here rudimentary or absent. As a whole, the 

 zygomatic arch is very long, slender, simple, curved upwards 

 and very slightly outwards, so slightly that it is completely 

 overhung by the superciliary ridge and frontal crest. 



The Lachrymals are unusually large, and form the anterior 

 part of the orbit ; they encroach considerably upon the face, 

 and articulate with the superciliary ridges above. The 

 lachrymal foramen is very large. 



The Maxillaries are of great length, being nearly as long 

 as then asals. They extend somewhat beyond the last molar ; 

 but the suture between them and the pterygoids is very 

 obscure. There is a very long diastema between the canine 

 and molar series, and the lower margin is arched upwards ; 

 above this, between the orbit and the socket of the canine, 

 there is a large, deep fossa, but we can discover no infra- 

 orbital foramina. The sockets of the canines are very large 



