418 Dr. C. W. Andrews on a new Baboon. 
stouter ; the deltoid crest is much less developed than in the 
mandrill. 
The radius is represented by one complete specimen and 
the upper ends of two others, one of very large size. The 
complete bone has its shaft less compressed and with a more 
rounded anterior face than in the mandrill; the muscular 
ridges are less marked than in that animal, but, on the 
other hand, more so than in the male Theropithecus, in 
which, however, the bicipital tuberosity is more feebly deve- 
loped. The bone, as a whole, is more slender than im the 
mandrill. Its dimensions (in millimetres) are :— . 
Width of Width of Width of 
Length. upper end. lower end. shaft. 
Simopithecus ......0. 200 16 23 ved olla 
Mien dirill eee cate oe 225 19 25 19 
Male Theropithecus .. 190 13 23 15 
Those of the corresponding bone in the mandrill and 
Theropithecus are given for comparison. 
The large radius measures 22 mm. across its upper end, 
indicating a larger animal than any baboon with which 
comparison could be made. 
The ulna is represented by one specimen from the left side, 
wanting the distal epiphysis. This is about the same size 
as the ulna of the Anubis baboon, but is more massive 
throughout. Its length (without the lower epiphysis) is 
224 mm ; the ulna of the mandrill (measured in the same 
way) 220 mm., and that of Theropithecus 195 mm. It indi- 
cates a large animal, but not so large as that to which the 
larger radius belonged. 
The os innominatum is represented by two imperfect speci- 
mens, one larger than the other and of very massive build. 
In both only the region of the acetabulum is preserved, the 
ends of the ilium, pubis, and ischium being lost. The pelvis 
is mdre heavily built than in the mandrill. The approximate 
antero-posterior diameter of the acetabulum is 30 mm., in 
the mandrill 28 mm., and in the male Theropithecus 25 mm. 
The femur is represented by the proximal end of a large 
specimen and the shaft of a smaller one, both of the right 
side. In the large specimen the diameter of the head is 
28 mm., the width of the neck 20 mm., the width of the 
upper end of the bone as a whole 56mm. In a mandriil 
femur 258 mm. long the corresponding measurements are 
25 mm., 18 mm., and 50 mm. The digital fossa is very 
deep, The shaft of the smaller specimen is nearly circular 
