1882.] PROF. FLOWER ON THE SKULL OF A CHIMPANZEE. 635 
is formed mainly by two lines, a short anterior and a longer poste- 
tior one, which meet at an open rounded angle at the highest point, 
which is considerably in front of the middle of the cranium. 
In addition to, and probably connected with, this peculiar form of 
cranium, is to be noted the absence of all trace of a fronto-parietal 
or coronal suture, and the partial obliteration of the sagittal suture, 
both of which in all other Chimpanzees examined are open long after 
the age to which this individual had attained. The sutures between 
the exoccipitals and supraoccipital are also consolidated to a greater 
extent than is usual at this age; but the temporo-parietal and the 
occipito-parietal or lambdoidal sutures are perfectly distinct. 
The following comparative measurements are taken from some of 
the principal points now usually adopted in craniometry : — 
Soudan West-African 
Chimpanzee, Chimpanzee. 
Basion to alveolar point............. . 76 72 
5 MARION Pee tay Aerek cope sire Wee 66 64 
a Ophayamse (he, Mies iia. aialen 73 70 
a middle of frontal bone ...... 84 74 
55 DrGP Ma 1.) j-ahew | Se oe 87} 74 
Length of cranium (ophryo-occipital) .. 103 107 
Maximum parietal width ............ 88 89 
Maximum frontal width ............ ad. 56 
It will be seen from these and from the figure, that the skull is 
Skull of a young Chimpanzee, 
actually shorter than that of a slightly younger specimen from the 
west coast, although so greatly higher as well as wider in the frontal 
region. It presents in fact a true case of the deformity recognized 
1 Owing to the absence of the coronal suture, the exact position of the bregma 
can only be guessed, 
