230 On a neio Porcuirine from East Africa. 



equally from the northern Hystrix cristata^ L., and the 

 southern H. africce-australis, Pet. It is not fully adult, the last 

 molar being still quite unused, although in position, and the 

 tooth-change not liaving yet taken place ; this change, how- 

 ever, occurs so late in life in the genus Hystrix tliat, judging 

 by other skulls, we may suppose that this skull would not 

 have greatly altered in size or form in later life. 

 The species may be called 



Hystrix galeata, sp. n. 



Skull approximating to that of H. cristata in the relative 

 lengths of the nasals and frontals (see measurements below), 

 but markedly different from that, as also from H. africce- 

 ausirah's, by the reduced breadths of the same bones, espe- 

 cially in the interorbital region of the skull ; so that the upper 

 inflated part of the skull is more or less parallel-sided, instead 

 of being broadly oval ; when viewed from above this appear- 

 ance is increased by the nasal bones being almost as broad 

 anteriorly as posteriorly and by the ascending process of the 

 premaxillffi being bowed out laterally ; the muzzle therefore 

 does not decrease evenly in breadth from the orbits forwards, 

 but is parallel-sided to the level of the anterior point of junc- 

 tion of the nasals and premaxill^e. These processes are also 

 much broader in a vertical direction than in the allied species, 

 and in this respect approach the Indian H. leucura. In con- 

 sequence also of the greater anterior breadth of the nasals and 

 of the bowing outwards of the ascending premaxillary processes 

 the nasal opening is very decidedly larger than in either of the 

 other African species. Supraorbital edges of frontal straight 

 or even slightly concave, the broadest point across the frontals 

 being at the rudimentary postorbital processes, not at the edge 

 of the lacrymal bones. In the side view the skull is remark- 

 able for its extreme height at about ^il, from which point it 

 slopes rapidly down, both forwards and backwards. Lower 

 anterior root of zygoma broad and flattened, as in the northern, 

 not styliform as in the southern species ; general size and 

 form of the ante-orbital foramen also very much as in the 

 former species. 



The molar teeth appear to be rather rounder in section, less 

 narrow and elongated than in //. cristata ; but much more 

 material is needed before the value of this character can be at 

 all properly estimated. 



Measurements of a Gambian skull of H. cristata, of the 

 typical skull of //. galeata, and of a Natal skull of H. africw- 

 australis (the last-named is fully adult, the other two have 

 each not yet shed their mp.^) : — 



