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



51 



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 peculiarity. 



This skull has all the characters of the genus Dendro- 

 hyrax, except that the orbit is incomplete behind. I think 

 that it indicates a new group, to which the name Heterohyrax 

 may be given. The skull is much smaller and the tooth-line 

 much shorter than in D. dorsalis ; and I propose to name it 

 provisionally Heterohyrax Blainvillii. The skull which M. de 

 Blainville figures as that of Hyrax rujipes (Ostdograph. t. 2) 

 exactly represents the hinder part of that in the Museum. It 

 cannot be the H. rxificeps of Ehrenberg. 



Dr. G. V. Jaeger figm-ed, under the name of Hyrax hahessi- 

 nicus (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 inter- 

 parietal. This skull is interesting as showing that the genus 

 is found in Abyssinia. 



Dr. G. V. Jaeger also figures the back of the skull and inter- 

 parietal bone of a species he calls Hyrax silvestrisj 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 intei-parietal 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 differing from D. dorsalis of West Africa ; so it may 

 be a new species of the genus, Dendrohyrax silvestris (Wiirzb. 

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



The Measurements of the Skulls^ in inches and lines. 



Length of skull 



„ tooth-line. 



Width, at centre ofl 

 zygoma, of fore- > 

 head J 



Width at back end of -1 

 orbit / 



Width of band at 

 middle of crown 

 over condyles ... 



Width of nose 



„ at outer edge "] 

 of tooth-line, at > 

 first molar J 



Width of palate at? 

 first molar $ 



2 U 



1 2 



1 81 



1 3 



7 



5| 



1 Oi 

 7 



lOJ 

 6 



3 4 

 1 2i 



1 U 



X 51 

 10 

 7 

 111 

 6 



4* 



