68 



MR. R. LYDEKKER ON A NEW 



[Feb. 19, 



of the cranium, showing the boundary of the nares, the whole of the 

 preniaxilla (of which the upper extremity is fractured and bent), and 

 the anterior portion of the maxilla. The true molars are unfor- 

 tunately wanting, but, with tlie exception of the third incisor, all the 

 other teeth are preserved, although the summits of the crowns of 

 the two remaining incisors are broken off. The position of the third 

 incisor is indicated by its alveolus, and the suture between the maxilla 

 and premaxilla clearly shown, both in the lateral and palatal 

 aspects. 



71771 1 



Hyracodontctkerium filholi ; from the Phosphorites of Central France. Palatal 

 and lateral aspects of the anterior portion of the crauium, nat. size. 



pmx., premaxiUa ; hij:., maxilla. 



On comparison with the figure of FT. primcEvum very striking differ- 

 ences are exhibited by the present specimen, which indicates a larger 

 animal. Thus, whereas the canine is nearly similar in the two 

 specimens, the first incisor of the latter is very much larger, and 

 the uarial aperture is likewise of much greater extent ; but whereas 



