1. HYBAX. 283 



** Fur soft 4. Hyrax Srucei. Abyssinia. 



6. Hyrax Alpmi. Abyssinia ? 



6. Hyrax sinaiticus. Sinai. 



7. Hyrax ferrugineits. Abyssinia. 



8. Hyrax irrorata. Abyssinia. 



9. Hyrax Bocagei. Angola. 



2. Etthybax 1. Euhyrax abyssmieus. Abyssinia. 



3. Dendbohybax 1. Bendrohyrax dorsalis. West Africa. 



2. Dendrohyrax arboreus. South Africa, Tete. 



3. Dendrohyrax Blamvillii, (Skull only.) 



1. HYEAX. 



Sktdl with a distinct narrow sagittal crest on hinder part of crown 

 when adult ; nose short. Diastema short, not equal in length to 

 the outer sides of the first three premolars ; grinders in an arched 

 line ; molars large, broad, square, much larger and broader than 

 the compressed premolars, the first one very compressed. Orbit in- 

 complete behind. Lower jaw very broad behind. Bladebone elongate 

 trigonal. 



Skull — nose short ; forehead flat or rather convex below the orbit ; 

 orbit incomplete behind ; the lower jaw much .dilated behind. The 

 diastema between the canines and the first premolar short, not so 

 long as the outer edges of the first three premolars. Lower cutting- 

 teeth elongate, narrow at the base, broader above, with three lobes ; 

 but the lobes are soon worn away, only leaving indistinct grooves 

 on the surface of the teeth. The lobes of the lower cutting-teeth 

 are distinct in the very young animals which have not yet cut their 

 premolars and last grinder. The upper cutting-teeth of the mUk 

 series are rounded in front, broad and spathulate at the end ; those 

 of the adult series are trigonal, with a strong central keel in front. 

 The grinders form an arched series ; the true grinders large, much 

 larger than the rather compressed premolars ; the first (permanent) 

 premolar (that is, the second in the series) small, compressed ; the 

 first premolar in the upper jaw of the milk series is triangular, with 

 three roots, the two hinder ones being close together. 



Hyrax, Gray, Ann. §■ Mag. N. H. ser. 4. i. p. 40. 



De BlainviUe, in the ' Osteographie,' figures the skeleton and the 

 skull of a species of this genus under the name of Hyrax syriacus ; 

 but I am not able tc)- determine to which of the species of tins genus 

 it belongs. H. syriaeus has almost a generic signification. 



The skull in the British Museum (725 e) that agrees with De 

 BlainviUe's figure of the interparietal bone of S. syriacus is rather 

 larger and has the front upper premolar rather larger than the 

 skuUs of H. capensis according with the same distinctive mark, viz. 

 724 6, 724 c, and 724 d, which were all received from the Zoological 

 Society without skins ; and the hinder openings to the nostrils are 

 more contracted in those named H. cajoensis than in H. syriaeus. 



De BlainvUle (Osteograph. t. 2) figures the skull of the very young 

 Hyrax eapensis as having all the four lower cutting-teeth three-lobed. 



