43 



is distinct, and is pierced by two small venous foramina. The 

 shape of the entire bone is much as we find it in the dog, 

 except that it does not arch so much. One of the most marked 

 differences between this genus :ind Palceosyops is here shown. 

 In the latter the forehead rises abruptl}' from behind the 

 orbit, while in the former there is only a slight rise for some 

 distance behind the orbit. As the bone is broken here, it is 

 impossible to state whether there is any rise at all. Prob- 

 ably not, however. Below the post-orbital process, on the 

 lateral aspect of the bone, there is a low ridge which separ- 

 ates the orbit from the temporal fossa. The under surface of 

 the frontal is smooth. 



The Nasal, of which but a small portion is preserved, is flat 

 on top, but bends downward at the angle. 



The Maxillary is long and stout , over the last and penulti- 

 mate molars it broadens to form the floor of the orbit, which 

 IS of unusual size. Between the canine and the malar the 

 maxillary arches inwards, forming a perceptible concavity, at 

 this point it reaches its greatest vertical height, as it rises to 

 join the nasal. The alveolar border is curved in two direc- 

 tions, one with the convexity outwards, and the other down- 

 wards. It exhibits no emargination in the diastema between 

 the canines and molars. The palatine plate is long, thick, 

 and narrow ; it is flat fore and aft, but concave transversely, 

 owing to the elevation of the alveolus ; the suture also is 

 raised slightly. In thickness it varies ; being thickest between 

 the canine and the second premolar, and beyond this becoming 

 thinner. Its forward termination seems to be obtuse, running 

 for a short distance along the premaxillaries. The infra- 

 orbital foramen is large, situated over the fourth premolar, 

 lower down, and nearer to the malar than in PalcEosyops. 



The Prcmaxillary is rather short and stout ; it is slightly 

 compressed, and ends in a sharp keel on top. Although not 

 so thick as in Palceosyops, it is much larger vertically. The 

 inner surface is ridged ; it has no palatine process, and no 

 spine, so that the incisive foramen is large and undivided. 

 There was no symphysis between the two premaxillaries, they 

 do not show even any articular faces for each other, so that 

 they may not have been in contact during Ufe. The animal 

 was adult, but not old. The incisive alveolus is short and 



