328 BUREAU OF AMERICAN ETHNOLOGY [bull. 52 



Finally, as to the inclination of the fronto-nasal articular surface, 

 it was found that a line drawn on the left, or better-preserved, side 

 from the nasion to the inferior end of the surface, forms wdth the 

 nasion-bregma axis an angle of 71°, almost exactly the same as in a 

 Piegan skull used for comparison (see pi. 51) and ver}^ much like that 

 found in the average Indian. Naturally, the more the fragment is 

 tilted backward, the more nearly vertical this surface becomes, as 

 would be the case in any other frontal. 



Resuming the subject, it is seen that the various characteristics of 

 the nasal notch, particularly when the fragment is placed in approxi- 

 mately the position it would occupy in a naturally-posed head, are 

 not merely entirely human but such that they may easily be taken 

 for those of a modern Indian and in fact they could be even those of 

 a modern white. On the other hand, they present important and in 

 many instances radical differences from similar structures in the an- 

 thropoid apes as well as in the lower Primates, including the Arcto- 

 pitheci. 



The glabella presents a considerable, though by no means unique 

 or especially unhuman, prominence. It is not massive. The region 

 is brought forward, as can be seen from the broken parts below, by 

 extraordinary development of the frontal sinuses, particularly their 

 median chambers (pis. 49, 50, 52). 



The following measurements relating to the protrusion of the gla- 

 bella in the Diprothomo skull will make possible comparison with 

 other specimens: An antero-posterior line from the center of the 

 glabella to the ventral wall of the frontal bone, slightly to one side 

 of the metopic ridge, on the right 22 mm., on the left 20 mm. ; same, 

 directly in the middle line (to a point 5 mm. above the foramen 

 caecum), 23 mm. 



The prominence and form of the whole supranasal part of the 

 frontal, though rare, can both be duplicated among Indian crania 

 (see pis. 52, 53). They would not appear as they do in the Dipro- 

 thomo irsignient were the distal halves of the supraorbital ridges of that 

 fragment well-developed ; as it is, they are prominent over the median 

 half and practically absent from the distal half of the supraorbital 

 space on each side, a condition which accentuates the impression of 

 protrusion of the middle region. And, what is more important, they 

 are not inferior, zoomorphic characteristics. They diverge from, 

 rather than approximate to, the specimen from Primates lower than 

 man, for in these the glabella attains no prominence and no similar 

 shape. 



The unhuman appearance of the glabella in the drawings pub- 

 lished with the first description of the specimen is due to the position 

 the bone was given, and to the artist's interpretation of what he saw. 



