one-horned Rhinoceros* 353 



The maxillary bone advances under the orbit, and forms 

 there a plate : there is no apophysis either of the frontal or 

 the jugal to join the zygomatic arch to the irons, and to 

 close the orbit behind. 



The sub-orbitar foramen is small, longer than broad, and 

 near to the bottom of the nasal indentation. 



The maxillary bones form before a projecting apophysis 

 parallel to the bones of the nose, and situated under them, 

 which articulates with the incisors. The alveoli of the in- 

 cisors form together an angle of more than eighty degrees 

 in the adult, but which is not sixty in the young individual. 

 The incisor foramen is very large, elliptic, and not divided 

 into two parts. 



,The incisor bones have at their upper edge a small apo- 

 physis, and a square plate which rises towards the roof, 

 formed by the bones of the nose. 



The latter are of a size and thickness of Avhich there is 

 no example in other quadrupeds: they form an arch which 

 inclines to the incisor bones, and which supports the horn. 

 In my adult individual their upper face is granulated like 

 the head of a cauliflower. 



Between them and the incisor bones and that part of the 

 maxillary bones which supports them, is that large nasal in- 

 dentation, which on the first view characterises the cranium 

 of the rhinoceros. It results from the depth of this inden- 

 tation that in this animal three pairs of bones, the nasal, 

 the incisors, and the maxillary, contribute to form the con- 

 tour of the external apertures of the nostrils ; while in other 

 quadrupeds, the tapir excepted, there are only the two 

 latter. The lacrymal bone is small, and advances a littla 

 on the cheek. It has a very broad lacrymal canal, before 

 which is a small pointed apophysis. 



The vomer is ossified only in its most remote part, and 

 there remains nothing in four-fifths of its length even in 

 my rhinoceros full grown, and in which all the sutures 

 were effaced. This remark is of great importance for a. 

 comparison of the living with the fossil rhinoceros. 



The posterior groove of the palate is very deep, for it ad- 

 vances opposite to the fifth molar tooth ; the suture which 

 separates the palatine from the maxillary bones corresponds 

 to the interval between the fourth and fifth molar tooth. 



The pterygoid apophyses are short in the longitudinal di- 

 rection, but very high in the vertical; single, and only a 

 little forked towards the end. 



The middle part of the sphenoid is straight, and proceeds 

 much further back than its pterygoid ala; its articulation 



with 



