the (?) Pliocene of British East Africa. 411 
numerous bones and teeth of Antelopes, Phacocherus, and 
Hippopotamus, together with portions of the skull, mandible, 
and limb-bones of the large baboon which forms the subject 
of the present paper. The bones were found in a greenish- 
grey sandstone exposed in a low cliff near the lake-shore 
west of the Awach River; the age of the bed is doubtful, 
but probably it was late Pliocene or early Pleistocene. 
PRIMATES. 
Family Cercopithecide. 
Among the more important specimens in Dr. Oswald’s 
collection are the numerous remains of a large baboon, which 
present a number of peculiar characters. The principal 
pieces are:—(1l) the facial portion of a female skull, the 
region belrind the lower part of the orbits and the greater 
part of the premaxille being wanting; (2) a mandible, 
probably belonging to.the same individual, wanting the right 
ramus behind the second molar and the angular region of 
the left ramus. ‘These two specimens form the basis for the 
description given below. In addition to these there are 
a right maxilla with the molars in excellent preservation, a 
portion of a left mandibular ramus with pm,—m;, part of a 
smaller right mandibular ramus witii pm ;—m., and the poste- 
rior portion of a left ramus showing the condyle and angle. 
There are also several odd teeth, including the lower canines 
of an old male. Altogether, the parts of the skull and 
mandible preserved indicate the presence of at least four 
individuals. 
The other portions of the skeleton represented are portions 
of humeri, radii, ulnz, ossa innominata, femora, the astra- 
galus, calcaneum, and cuboid; these belong to several 
individuals, differing considerably in size. All the remains 
are highly mineralized and in a beautiful state of preserva- 
tion ; in nearly all cases they terminate in fresh fractures, 
showing that further collecting would probably yield more 
complete material. 
Skull (Pl. XV. figs. 1 & 2).—The most important specimen 
is the facial portion of a skull, which, from the small size of 
the canine, is clearly that of a female. The whole of the 
cranial portion is wanting, the fracture occurring at about 
the middle cf the orbits, only the lower portions of which 
are preserved ; the base of the jugal region of the zygomatic 
arch is preserved on both sides, but is most nearly complete 
on the right. ‘The nasals are wanting, as also are the tooth- 
bearing portions of the premaxille. ‘The only other portion 
