80 
THE MAMMALS OE EGYPT. 
skulls of P. cynocephalus The posterior cusp of the last lower molar is well developed 
and nearly mesial in position. The symphysis of the lower jaw is much more vertical 
than in P. cynocephalus. The pit on the side of the mandible and the lateral 
compression on the side of the maxilla are much less marked than in that species. 
There are many peculiar features connected with this unique baboon, bnt the figure of 
the skull here given (Plate XIV.) may tend ultimately to throw some light on its real 
nature, and so possibly to reduce it to the rank of an albinoid sport. 
The measurements of its skull are as follows:— 
Extreme length of skull (tip of premaxillaries to external occipital pro 
tuberance). 
Anterior border of foramen magnum to tip of premaxillaries. 
Tip of premaxillaries to glabella. 
Glabella to external occipital protuberance. 
Minimum frontal diameter. 
Maximum interzjgomatic breadth. 
„ intermalar breadth across middle of orbit. 
Vertical height of orbit.. 
Breadth of orbit. 
Distance from middle of lower border of orbit to end of nasals. 
Breadth of muzzle immediately before and below orbit. 
„ „ external to 1st premolar. 
„ „ opposite to end of nasals. 
Anterior border of foramen magnum to posterior border of palate 
Length of palate (mesial line). 
Breadth of palate between middle of last molars. 
,, „ „ 1st premolars. 
Extreme length of lower jaw. 
Vertical depth through coronoid process. 
Alveolar border of lower jaw to posterior (digastric) border of symphysis . . 
Breadth of lower jaw at posterior root of 1st premolar. 
Length of 1st upper molar. 
„ 2nd ,, ,, ... 
)) ^*’*1 }J 3) .. 
„ 1st lower „ . 
33 2nd „ ,, .... 
33 3rd ,, j, . ... 
mm. 
180 
131 
119 
109 
56 
102 
79 
26 
29 
47 
44 
47 
36 
47 
86 
27 
29 
134 
64 
42 
33 
10 
12 
12 
10 
12-6 
15‘5 
Beyond, the length of the tail and that of the hind foot, there are no measurements 
extant of the dimensions of this baboon in life. The tail was 570 mm. long, and 
the hind foot 210 mm. Mr. Thomas found the skin of the head and body to be 
750 mm. in length. The specimen was a male. 
