324 BUREAU OF AMERICAN ETHNOLOGY [bull. 52' 



The parietals must have been decidedly shorter than the frontal; 

 their maximum length in horizontal line could not have exceeded 5.5 

 cm., their surface arc 9 cm. 



The skull differs markedly from that of man in its antero-posterior 

 curvature, which commences to descend even in the posterior part 

 of the frontal squama; the rear part of the specimen shows a rapid 

 descent backward and downward, and the occipital could not have 

 been seen from above. 



There is a large postglabellar depression, which resembles that in 

 the gibbon and the Arctopitheci and does not face forward as in 

 man, but nearly upward. 



The supraorbital ridges are narrow (5 mm.) proximally, and broad 

 (15 mm.) distally; they become effaced near the outer side of the 

 frontal eminences. 



The glabella in its inferior portion is completely distinct from that 

 of man; it presents a marked prolongation forward and lacks com- 

 pletely the backward inversion of its lower part. 



The naso-frontal suture is different from that of man; above it is 

 rounded but wide and it continues to widen as it descends, so that at 

 "the inferior level of the frontal it must have had a transverse diam- 

 eter of nearly 3 cm.". 



The superior orbital borders are very slightly arched; their distal 

 portions constitute a slender, nearly cutting border, which is different 

 from that found usually in man, and represents the primitive form of 

 the visor; the median part of each su})raorbital arch is very stout 

 (15 mm.). 



The roofs of the orbits do not pass backward, as in man, but a few 

 millimeters to the rear of the orbital border turn downward, a feature 

 from which it appears that the orljital cavities were very shallow and 

 that the eyes must have been very protruding; the small depth of the 

 orbit superiorly was undoubtedly compensated for by a greater exten- 

 sion forward of each inferior part and there was pronounced facial 

 prognathism; the orbital cavities were large, placed far forward, and 

 visible to a great extent when looking at the skull from above. 



The fronto-nasal suture is situated very nearly at the level of the 

 superior border of the orbits; a horizontal line crossing it passes 

 through the superior orbital borders. 



The surface of insertion of the nasal bones looks forward; the nasal 

 bones extended straight from the frontal and were very strong as 

 well as very wide; also, they were directed forward with only feeble 

 inclination downward.^ 



1 For numerous additional details of less importance the reader must be referred to the original. 



