68 MR. R. LYDEKKER ON A NEW [Feb. 19, 
of the cranium, showing the boundary of the nares, the whole of the 
premaxilla (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 the 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. 
Hyracodontotherium filholi; from the Phosphorites of Central France. Palatal 
and lateral aspects of the anterior portion of the cranium, nat. size. 
pme., premaxilla; m., maxilla. 
On comparison with the figure of H. primevum 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 narial aperture is likewise of much greater extent; but whereas 
