1892.] SPECIES OF THE HYRACOIDEA. 73 



better proof could be needed of the close external resemblance which 

 P. grayi bears to P. bocagei. But this specimen is of further interest, 

 for while it has the completed orbits of P. gruiji, it has the closed 

 coronal sutures ordinarily characteristic of adult P. bocugei; while 

 the type of P. grayi, nios't kindly lent me for comparison by Prof du 

 Socage, has at stage V. the coronal and the parieto-interparietal 

 suture of the right side still open, the left one was closed. This 

 closure at stage V. is very characteristic of P. iocagei ; but, had it 

 not been for the second specimen, one might have been doubtful 

 whether the coronal suture was destined to close in P. grayi. 



While leaving the question still open, however, I may point out 

 tiiat one external character, when observed, will really settle it. If 

 a P. grayi is found with only — 1 = 2 mammae, it will be uDendro- 

 hyra.v and a distinct species ; but if, as I expect, it has 1 — 2=6, as iu 

 P. brucei, &c., there will be no longer any reason for keeping it sepa- 

 rate from P. bocagei *. Both the examples before me are males, 

 and therefore the discovery of its mammary formula must wait until 

 more sj)ecimens are collected.] 



11. Procavia emini. 



Dendrohyrax emini, Thos., Ann. Mag. N. H. (5) xx. p. 440 (1887), 

 P. Z. S. 1888, p. 15, pi. ii. (animal). 



Not having received any further examples of this remarkable 

 species, I can only reproduce tlie salient points of my original dia- 

 gnosis, which is based on a young specimen still only at stage I. 



Fur very long, soft, and fluffy. General colour pale yellowish 

 white, not unlike the belly colour of P. arborea. Hairs above brown 

 for their basal, and pale yellow for their terminal halves. Belly hairs 

 white to their roots. 



Dorsal spot white, the hairs white throughout. 



Skull about the same size and shape as that of a P. dorsalis of 

 the same age, markedly narrower and more elongated than that of 

 similarly aged specimens of P. shoana. Orbit not closed posteriorly. 

 Interparietal sutures open. 



Teeth not distinguishable at this early age from those of P. dorsalis, 

 except that mp^ is decidedly narrower. Breadth of mp* 56 mm. ; 

 height of its crown 4*1 ^. 



Bab. Monbuttu, Central Africa {Dr. Eniin Paslia). 



I am unable to give further particulars about this animal, owing 

 to the want of adult specimens, but an increased knowledge of the 

 group in general only convinces me more of its distinctness from any 

 other species. In one respect it is especially interesting as showing 

 a general relationship to Dendrohyrax, while it has not the one par- 

 ticular cranial character supposed to be distinctive of that group, 

 the completed orbit. 



^ The mammary formula of P. bocagei itself is not as yet absolutely known, 

 bat I have little doubt that it is the same as that of its close ally P. brucei. 



^ By mistake the dimensions of this tooth were given in 1888 as those of 

 m^ ; but the specimen is younger than I then realized, and ^ has not yet been 

 developed. 



