48 Dr. J. E. Gray on the Species o/'Hyrax. 



'' The skull of my specimen from the coast (regarded as H. 

 arhoreus in the ^Mammalia of Mossambique') agrees pretty- 

 well with that of H. habessinicus and with another skull sent 

 by Heuglin from Abyssinia, I cannot understand how this 

 species could be confounded with H. cajyensis^ 



I may add that H. abyssinicus cannot be H. dorsalis, as the 

 former has a black and the latter a white dorsal spot, which is 

 well marked in both species. 



3. Dendrohyrax. 



Skull rather elongate, with a broad flat crown, separating 

 the entire length of the temporal muscle in the adult animal ; 

 nose elongate, produced. Diastema elongate, longer than the 

 length of the outer sides of the first three premolars ; grinders 

 and premolars in a nearly straight line, and nearly of the 

 same form, the front premolar being only a little smaller. 

 Orbit complete (or incomplete even in a mature skull). 



Nose rather produced ; forehead flat ; temporal muscles mo- 

 derate, separated in the adult skull by a broad flat crown ; 

 the upper edge of the occipital bone thick, broad, forming 

 part of the crown ; lower jaw broad, rounded behind. Lower 

 cutting-teeth moderately long, rather contracted at the base ; 

 upper edge dilated and divided into three nearly square, rather 

 spathulate lobes. The lower cutting-teeth are rather elongated 

 in the older animal, but never so long and slender at the base 

 as in the true Hyraces. The upper cutting-teeth of the milk 

 series are rounded in front, and obliquely truncated, spathulate 

 at the end. The canine of the adult series is trigonal, with 

 the keel in the front as in the true Hyraces. The diastema 

 between the canine and the first premolar, in the adult skull, 

 is elongate, as long as the outer margin of the three premolars. 

 The grinders form a very slightly arched series. The true 

 grinders moderate, not much larger than the broad square pre- 

 molars. The first permanent premolar nearly as large as the 

 second one. 



The' skull of Dendrohyrax dorsalis may be known from 

 those of Hyrax and Euhyrax, in the youngest state, by the 

 large size of the half-oblong interparietal bone, which is nearly 

 twice as wide as long. In the nearly adult skull it occupies 

 the whole space of the hinder part of the crown. The skull 

 of this genus is also peculiar for the upper part of the occipital 

 bone being produced and expanded, and forming the hinder 

 part of the crown, the hinder edge of the flattened part being 

 keeled and sharply produced in the centre. 



There is the skull, with only a few teeth, of a very young 



