88 ON THE EXTINCT MAMMALIA OF 



specimen, but the lachrymal fossae are wider and the upper part of the snout flatter. 

 The "-rooves from the supra-orbital foramina strongly impress the baclc part of the 

 nasals, which is not the case in the former skulls. Tlie posterior nasal triangle is 

 acute, fourteen lines long at the middle, and eight lines wide at the ends of the frontal 

 angular jorocesses. 



4. A mutilated skull with the lower jaw. It nearlj' agrees with the preceding. 

 Sagittal crest undivided. Anterior parietal border deeply notched. The fore part 

 of the squamo-parietal conjunction forms a stout ridge bounding a groove curving 

 down in front of it. In the preceding specimens the corresponding ridge is moi'e or 

 less obsolete and the groove in advance inconspicuous. The supra-orbital foramina 

 are double the distance apart they are in the other specimens, and the forehead on 

 each side is more prominent. The orbits are rotund ; the lachrymal fossas broad and 

 deep. The snout is wider above than in the preceding skulls, and less convex. 

 The nasal bones are comjDaratively broad. The posterior nasal triangle is acute, 

 fourteen lines long, and nine lines wide. 



The teeth are very much worn in this specimen, more so than in any of those 

 under special examination. The enameled crown of the first true molars in both 

 jaws is nearly obliterated, and the canines are worn so that the breadth of their 

 crowns much exceeds their length. 



5. A mutilated skull, without the crowns of the upper teeth and the lower jaw. 

 It is slightly more robust than the three preceding specimens. 



The sagittal crest is comparatively long, and continues uninterrupted to the 

 anterior border of the parietal, which is transverse or descends on each side in a 

 slightly zigzag manner, without forming a notch for the reception of the frontals. 

 The forehead is more depressed than usual along the middle. The orbits are sub- 

 rotund. The lachrymal fossae are wide and deep. The supra-orbital groove is more 

 conspicuous. The snout is comparatively broad and more square in transverse sec- 

 tion from the upjaer part being wider and more flat. The nasal bones are broad. 

 The posterior triangle formed by the latter together is acute, seventeen lines long 

 and over eleven lines wide between the frontal angular processes. From the remain- 

 ing fangs of the upper teeth, these appear to have been of about the same size as in 

 the preceding specimens. 



6. A nearly complete skull, most injured at the snout. It has the lower jaw 

 separated in a wide-open manner. Imbedded in the same mass of matrix, in contin- 

 uity with the skull and bent around upon one side of it, there are fifteen mutilated 

 vertebrae. The skull is about as robust as in the specimen last described, but the snout 

 is less wide, and is narrower and more convex above. The forehead is also less de- 



