48 Dr. J. E. Gray on the Species of Hyrax. 
‘The skull of my specimen from the coast (regarded as H. 
arboreus in the ‘Mammalia of Mossambique’) agrees pretty 
well with that of H. habessinicus and with another skull sent 
by Heuglin from Abyssinia. 1 cannot understand how this 
species could be confounded with A. capensis.” 
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 
art 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 eae for the upper part of the occipital 
bone being produced and expanded, and forming the hinder 
art of the crown, the hinder edge of the flattened part being 
t oled and sharply produced in the centre. 
There is the skull, with only a few teeth, of a very young 
