the (?) Pliocene of British East Africa. 413 
Probably, however, the precise relative position with regard 
to the teeth varies considerably with age and sex. 
There are two small facial foramina about 5 mm. apart on 
the suture between the maxilla and jugal ; the upper opening 
is about 1°5 em. beneath the orbit; in other ape skulls 
examined these openings do not occur on the suture, but 
perforate the maxilla. 
The palate is strongly concave from side to side, and the 
slit-hke posterior palatine foramina are on the maxillo- 
palatine suture at about the level of the posterior lobe of ms. 
The Upper Teeth (P1..XV. figs. 2 & 3).—In the skull above 
described the tooth-series from the canine to the last molar 
is well preserved on the right side, while on the left pms is 
missing; the premolars and first molar are in an advanced 
state of wear, the pattern of the crowns being obliterated. 
A second specimen of the right maxilla (fig. 3) has m,—m; 
well preserved and ina much less advanced state of wear, the 
posterior columns of m; being still intact. 
The upper molars in their general structure are very 
similar to those of the recent baboons ( Papio, Theropithecus), 
but differ in their relatively larger size, and especially in their 
greater length in proportion to their width; in the last 
character they resemble the molars of Theropithecus most 
nearly. The intermediate cusps are well developed, so that 
in wear the inner tubercles show a well-marked trefoil 
pattern. There is a well-developed cingulum on the front 
and back of the molars. The upper premolars present no 
special peculiarities, while the canine is small and projects 
little below the premolars, showing that the individual was 
a female. The form of the crown of the canine is almost 
identical with that seen in a female specimen of Thero- 
pithecus gelada. 
The dimensions of the skull (in millimetres) are :— 
Width at outer ends of base of zygomatic process ...... 110 
Depth of face from orbit to alveolar border ............ 45 
Width of palate between the first molars.............. 28 
The dimensions of the upper teeth (in millimetres) are :— 
Length, Width. 
Ms ateteteh Shr eens 2 hoe 15 
(iE: = OP OCETIOEL 15 13 
TO. 2 6S OO ED OOOUE 12 11 
Fi. — Bee ae 7 10 
{SUES PAGER ORAL 7 8 
7E Go EA ack LCR 8 7 
The measurements in m,-pms are taken on the surface of 
Ann. & Mag. N. Hist. Ser. 8. Vol. xviii. 28 
