TERTIAEY VERTEBRATA OF THE FAYCM. 
] 8 () 
flattonod ischial iiihcrosity {isc.t.). The outer surface of the ischium is in almost the 
same plane as the oluteal surface of the ilium. The pubis (pu.) is a .stout bar of bone 
compressed from above downwards. On its anterior border beneath the acetabulum is a 
well-marked pectineal tuberosity (pt.); towards its inner end it widens out and terminates 
in a fiat oval surface by which it unites in symphysis {spni.) with its fellow. Behind 
this surface there runs back to the ischium a thin bar of bone, closing the obturator 
foramen. This bar has a thin sharp edge, and neither it nor the ischium seems to have 
united with the corresponding portion of the opposite os innominatum. The obturator 
foramen {obt.f.) is an elongated oval. The acetalndar cup (acet.) is nearly circular in 
outline ; it is deep, its edges being ])rominent and thickened, particularly in front. 
Its border is complete, there being no cotylar notch, which is only represented by a 
passage ( /’.) running through the posterior wall of the acetabulum from just above the 
anterior end of the obturator foramen and opening into the posterior end of the pit for 
the ligamentiim teres Q.t.), which is a deep elongated depression at the bottom of the 
acetabulum. This arrangement is also found in a very similar pelvis of Brachijodiis 
(ifriccmus from Moghara and in Ilippojwtamus : this last genus, in fact, seems to bt' 
intimately related with these African Anthracotheres, and annectant forms similar 
to Merycopotamus will probably be discovered in the Miocene beds between Moghara 
and the Wadi Natrun, in the Lower Pliocene deposits of which remains of a primitive 
Hippopotamus have already been found. The dimensions (in centimetres) of this 
specimen are : — 
Total length of o.s innoiiiinatum 37'2 
„ ilium from centre of acetabulum 20-4 
„ ischium from centre of acetabulum .... 17'5 
Width of peduncle of ilium d 
„ crista ilii 16'4 
Diameter of acetabulum 5-2 
Length of obturator foramen 9'4 
Width of pubic bar on inner side of obturator foramen . . . I'o 
Length of symphysial surface of pubis 5-5 
Depth of symphysial surface of pubis 3 
M. 9242. Plaster cast of the above specimen. Made in the British Museum. 
C. 9224. Portion of left os innominatum, wanting part of front of ilium and the pubis. 
IT. 8866. Portion of left os innominatum. Presented hy the Egyptian Government, 1904. 
■M. 8864 a. Complete left tibia. The most notable character of this bone is the slenderness of its 
distal portion compared with the heaviness of its upper end. The outer facet lor the 
femur is concave from side to side and strongly convex from before backwards ; its 
inner edge forms a rounded ridge separated by a groove from the rais('d outer edge oi 
the inner facet, tlie two together forming a bifid intercondylar prominence. The inner 
facet is concave from side to side and nearly flat from before backwards. In front of the 
articular surface the upj»(‘r end of the large cnemial crest forms a broad flattened surface. 
The up{)er ])ortion of the shaft is trihedral ; its antero-cuxternal side is deeply concave, 
the ))Osterior slightly so; this latbu- fac«! is overhung by the posterior border of the 
proximal articulation, Tlu! cnemial crest disappears about hallway down the shall. 
