294 



HYEACIBiE. 



K/ 



molars and premolars, in a nearly straight line, and the great length 

 of the diastema which is so cliaracteristic of this section of the 

 genus. It may be the skull of the D. arhoreus of South Africa. It 

 diiFers fi-om the skull of D. dorsalis in being small, in the forehead 

 being convex in the centre between the orbits, and in the orbits 

 being incomplete behind. It has the alveoli of the upper cutting- 

 teeth each raised into a cup round the base of the tooth ; but this 

 may be only an individual jieculiarity. 



This skull has all the characters of the genus Dendrolujrcuv, ex- 

 cept that the orbit is incomplete behind. I think that it indicates 

 a new group, to which the name Heteroliyrax may be given. The 

 skull is much smaller and the tooth-line much shorter than in D. 

 dorsalis ; and I propose to name it ])vovisionaI\.j IleleroJiy rax Bhi'm- 

 vilUi. The skull which M. de Blainville figures as that of Hyrax 

 rufipes (Osteograph. t. 2) exactly represents the hinder part of that 

 in the Museum. It cannot be the H. rujiceps of Ehrenberg. 



Dr. G. V. Jaeger figured, under the name of Hyrax hahessinkus 

 (t. 2. f. 14), the upper part of the skull of a Dendrohyrax obtained 

 from Gondar by Dr. von Heuglin. Dr. Jaeger, by mistake, figures 

 the upper edge of the occipital for the interparietal. This skull is 

 interesting as showing that the genus is found in Abyssinia. 



Dr. G. V. Jaeger also figures the back of the skuU and interparietal 

 bone of a species he calls Hyrax sllvestris, collected in West Africa 

 by the missionary Dieterle. It is probably a Dendrohyrax. The 

 hinder part of the figure is the upper edge of the occipital. The 

 interparietal is urn-shaped, broader in front and contracted behind, 

 very unlike that found in the skulls of either of the two species in 

 the British Museum, and especially diff'ering from D. dorsalis of 

 West Africa ; so it may be a new species of the genus, Dendrohyrax 

 Sllvestris (Wiirkb. naturw. Jahresb. xvi. p. 162, t. 2. f. 15). 



