Sinclair-furlong.] Euceratherium, a New Ungulate. 



415 



by a low ridge along- the line of the fronto-lachrymal suture. 

 Anteriorly and interiorly the boundaries of the fossa are 

 indefinite. 



The maxillary is considerably inflated some distance above 

 the alveolar border, giving- to the face a swollen appearance. 



The anterior opening of the infraorbital canal on the left side 

 is double and is situated above the anterior margin of the fourth 

 premolar, the smaller foramen opening above the larger one. 

 On the right side, the opening of the canal is single. 



Dentition. — The dentition resembles closely that of Ovibos, 

 but the length of the superior series is somewhat shorter than in 

 that genus. The teeth are hypsodont, without trace of cement 

 or accessory cuspules. The second premolar on the left side is 

 wanting, and the third is abnormally inserted with its outer wall 

 in contact with the anterior margin of the fourth. In the 

 occlusal view (Fig. 1) the premolars of the opposite side have 

 been drawn. 



Fig. 1. Euceratherium colUnum. Left superior dental series, X t- 



The pattern of P- has been obscured by wear. The wall of 

 the inner crescent of P- is interrupted by a sharp angulation, 

 while that of the fourth presents the usual lunate outline. The 

 teeth possess the typical selenodont structure characterizing the 

 Ovinae. The external styles are prominently developed, bound- 

 ing depressed areas with broadly convex median ribs. The lakes 

 are narrow, and owing to the absence of cement remain open 

 even in well worn teeth. The molars display the deep pit pro- 

 duced by the confluence of the walls of the inner crescents which 

 is characteristic of Haplocerus and the sheep. Superior incisors 

 and canines were undoubtedly absent. 



