224 Proceedings of the Royal Physical Society. 
teriorly into the supra-spinous region of the occiput. The 
skull possesses a well-marked oval form. The muscular 
ridges and prominences are not very strongly pronounced, and 
the cranial bones possess none of that coarseness and thick- 
ness which are so often regarded as characteristic of the negro 
skull. In its internal capacity the skull measures 79 cubic 
inches, which is somewhat below the mean of 83 cubic inches 
given by Dr Morton as the average capacity of the negro 
crania he had examined. The following are some of the 
principal external dimensions of the skull, expressed in 
Mang-anya Skull — Fig. 1. 
inches and tenths: — Extreme length, 6*7; breadth (parietal), 
5-0; height, 5*2. Greatest frontal breadth, 4-2; parietal, 
5-0 ; occipital, 3-8 ; zygomatic, 4*7. Fron to-nasal radius, 
3*5 ; maxillary, 3*9 ; frontal, 4*3 ; parietal, 4-7 ; occipital, 
3-4. Longitudinal arc, 14*0 ; frontal, 5*0 ; parietal, 5*0 ; 
occipital, 4*0. Frontal transverse arc, 11*1; parietal, 12 "8 ; 
occipital, lO'O. Horizontal circumference, 19 0. The ratio 
of length to breadth is 100 to 75 ; of length to height, 100 
