IHCOI \ I. IN 1 OF A MK IMC \. 333 



Tlic top of the cranium or forehead, considered as extending from the inion to the root 

 of the nose, is broader at the post-orbitar processes than it is long, but in the Peccary 

 the length greatly exceeds the breadth. It is also more convex antero-posteriorly, but 

 much less so transversely, being nearly flat. 



The orbito-frontal foramina and the vasculo-ncural grooves leading from them to the 

 side of the face, hold the same position as in the Peccary. From the depression of the 

 forehead the orbit appears more elevated than in the latter: the lachrymal tubercle being 

 only eight lines below the level of the forehead in the fossil, while it is one inch below it 

 in D. torquatns. 



The temporal fossa has the same form as in the latter, but its surface extends more 

 outwardly in the direction of the post-orbitar processes. Its length is absolutely not 

 greater than in D. torquatus, but it gains in depth and extent by the increased depth of 

 the zygomatic process. 



The malar bone is of extraordinary depth, relatively very much more than in the Pec- 

 cary. Its outer side is not depressed, as in the latter, but is antero-posteriorly convex, 

 and the inferior margin rises much more upwardly. The masseteric surface of origin, 

 instead of being directed downwards, as in the Peccary, presents more outwards, as in 

 the Hippopotamus, and the acute margin bounding it externally ceases at the maxillary 

 suture, while in the Peccary it is continuous with a highly characteristic prominent, acute 

 ridge of the maxillary bone, advancing anterior to the position of the infra-orbitar foramen. 

 The maxillary bone in the fossil, immediately in advance of its conjunction with the ma- 

 lar bone, is elevated into a protuberance upon the same level as the outer surface of the 

 malar bone. The latter rises much higher upon the face than in the Peccary, reducing 

 the nasal process of the superior maxillary bone into a relatively narrow strip, and aiding 

 in the elevation of the orbit anteriorly. 



The transverse diameter of the orbit is greater than the vertical and its direction 

 obliquely upwards and forwards, but in the Peccary the former is the shorter diameter and 

 its direction downward and forward. 



The face, anterior to the temporal fossa, is relatively very long, compared to that of 

 the Peccary. It is also relatively narrower, principally from the absence of the ridge of 

 the maxillary bone continuous with the malar bone in the latter, which also renders it 

 nearly vertical from the edges of the ossa nasi at its anterior two-thirds. 



The central part of the sides of the face, over the position of the infra-orbitar foramen, 



in ;i\e. ,ind is most deeply so just anterior to the latter foramen, which is oval in its 



form and situated above the interval of the third and fourth molars. The alveoli have a 



more advanced position in the lace; than in the Peccary, in which the last molar is on a 



line with the ant-orbital margin, but in the fossil is placed an inch anterior to it. 



The upper part of the face, as constituted by the ossa nasi, is for the most part broken 

 away in the fossil. Its posterior part is broad and only a little convex transversely, 

 while it- anterior thn e-fourths, judging from a small remaining fragment, appears to have 

 been as convex as in D. torquatus. 



The anterior extremity of the face is more pointed than in the Peccary from the ad- 



