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Orthognathous, or-thog′nā-thus, adj. straight-jawed—also Orthognath′ic.—n.

The cephalic index is 70.5, the nose is depressed at the root, almost platyrrhine; the broad face is remarkably orthognathous and the forehead is slightly retreating with prominent brow arches; the lips are thin, and the skin is dark brown.

Bantu: moderately prognathous and even orthognathous; Negrillo and Bush.-Hot.: highly prognathous.

There is little or no brow prominence and one at least of the skulls is as orthognathous in facial angle as that of a European.

The conformation of the skull is second only to the colour of the skin as a criterion for the distinction of race; and the position of the jaws is recognized as important, races being described as prognathous when the jaws project far, as in the Australian or Negro, in contradistinction to the orthognathous type, which is that of the ordinary well-shaped European skull.