524 



3113. The skull of the Hyrax capensis. 



Traces of the suture between the super- and ex-occipitals still remain. A small triangular 

 interparietal is wedged between the back part of the parietals. The last molar has partly 

 emerged from its formative socket in both jaws. 



Purchased. 



3114. A mutilated cranium of a young female Hyrax capensis. 



The four deciduous molars and first true molar are in place on each side : the second true 

 molar is partly extricated from its socket. The crowns of the permanent incisors are exposed 

 above the deciduous ones : they are lodged in the premaxillaries. 



Presented by the Zoological Society of London. 



3115. The lower jaw of the same Hyrax. 



The outer alveolar wall has been removed from the right ramus, so as to expose the germs 

 of the two permanent canines, of the second true molar, and the formative alveolus of the 

 premolar beneath the third deciduous molar. 



The following are parts of the skeleton of a young Hyrax arboreus : 



Presented by the Zoological Society of London. 



3116. The mutilated cranium. 



The deciduous incisors, the four deciduous molars, and the first permanent molar on each 

 side, are in place : the crown of the permanent incisor is exposed on the right side. The 

 ascending process of the malar bone articulates with the postorbital process which is formed 

 by both the parietal and frontal bones. There is no interparietal. The tympanic, which 

 forms the bulla ossea at the basis cranii, has not coalesced with the petrosal. The mastoid 

 has coalesced with the squamosal. The elements of the occipital bone are still ununited. 



3117. The lower jaw. 



The deciduous incisors have the crown deeply divided into three processes, like a trident. 



3118. The atlas. 



The hypapophysis is still distinct. 



3119. The dentata. 



The centrum of the atlas, which forms the odontoid process, is still distinct. 



3120. The five other cervical vertebrae. 3121. The twenty-one dorsal vertebrae. 



