556 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



smooth. Tho lower portion of the Mietopic crest is, in a large propor- 

 tion of the skulls. al)sent or nearly so, the ethmoid depression is very 

 deep, the crista g-alli insignificant, though not wholly wanting. The 

 outline of a horizontal plane of the skull above the orbits is nicely 

 ovoid, dirt'ering from that in man by greater convergence of the parie- 

 ties toward the median line in front; in other words, the frontal region 



Fig. 4.— Skull of m.\le orang (Cat. No. 142198 U.S.N.M.). «, Arch in the dorsum sell.«: / 



COMPLETE KEXE.STRUM .\BOUT THE GASSERIAX GANGLION. 



of the orang brain is more pointed tlian in man. In the gibbon and 

 lower primates this condition is still more accentuated. 



The spinous foramen is absent; it is merged with the foramen o\ale, 

 which is spacious. 



The middle and posterior clinoids, and in some cases the anterior 

 ones also, are united l)y a bridge which completes a large pituitar}' 

 foramen. In six cases only is this union wanting and in two others it 

 is on one side incomplete. The dorsum selhe is in seventeen skulls (11 



