850 ON FOSSIL HYRACOIDS FROM THE FAYUM. 



M. 9220 ; puratype ; fragment of left mandibular ramus, bear- 

 ing P — M 171 situ ; P M , and M.^ being imperfectly repre- 

 sented. The mandibular ramus, as well as the teeth, is smaller 

 than that of the foregoing specimen. It may be possible that 

 this specimen belongs to a female, and the foregoing one to a 

 male. 



The ramus measures as follows (in mm.) : — 



Depth of ramus at anterior end of P 34 



Ditto at anterior end of M 37 



Ditto at posterior end of M 45 



Height of ascending bar at condyle 120± 



Minimum height of the same at the concavity 



between condyle and coronoid process 116 



Minimum antero-posterior width of the same just 



below condyle 55 



The teeth measure as follows (in mm.) : — 



Length. Width. 



P.3 16-5 12-5 



P — 14 



Mj — 15-5± 



M.^ 21 18 



M 30+ — 



.3 — 



0. 8801 ; fragment of posterior part of skull, including occiput 

 (?this genus and species). 



It is almost certain that this skull, illustrated by Andrews in 

 his text-fig. 39, Oat. Tert. Yert. Fayum, Egypt, 1906, does not 

 belong to either Geniohyus or Megalohyrax., since it differs veiy 

 much from the known skulls of these genera. ^Naturally, there 

 may be a possibility that it belongs to Titanohyrax, and even to 

 the present species, though of course it is not certain at present. 



