Journal of the Academy of Natural Sciences of Philadelphia . om behind. In brachycephalic skulls the parieto ecto-petrosal suture isseen in the norma occipitalis, but in dolichocephalic it lies on the norma a graphic sense the distinction between these two important types can be thusdiscerned without other definition or measurement. Wilson used the term in-termastoid arch for the limitations of the field of the norma occipitalis and repre-sented it as the line formed between the mastoid processes. When the term pen-tagonal is employed in describing the norma, it means that the ent
Journal of the Academy of Natural Sciences of Philadelphia . om behind. In brachycephalic skulls the parieto ecto-petrosal suture isseen in the norma occipitalis, but in dolichocephalic it lies on the norma a graphic sense the distinction between these two important types can be thusdiscerned without other definition or measurement. Wilson used the term in-termastoid arch for the limitations of the field of the norma occipitalis and repre-sented it as the line formed between the mastoid processes. When the term pen-tagonal is employed in describing the norma, it means that the entire contour isresolved into five facet^like lines; but two of these, namely, at the upper two-thirds,are not part of the occiput at all, but are derived from the parietal bones. Thepeculiarities of this norma occipitalis are so much more numerous and conspicuousthan those of the norma frontalis that special attention will be given them. 1 For definitions for the terms post-obelion and intertubera see the authors Toner Lecture,Smithsonian Institution, Fig. 25.—Norma occipitalis of an Egyptian skull () showing great deformation the result ofabsorptive processes going on in the porose inter-temporal space (sconce). The abrupt interruptionin the curve of the lateral contour represents theposition of the temporal ridge. 54 JOURN. A. N. S. PHILA., VOL. X. 432 CRANIA FROM THE MOUNDS OF FLORIDA. Beside observing on what part of the occipital region the skull rests on agiven plane, the curvatures of the several component parts are to be noted, especiallythe curve from the omsthion to the inion. the one from the inion to the lambda, JL and another from the lambda to the intertuberal. When these curves are incon-spicuous, and a uniform curve, or one nearly so, extends from the opisthion to apoint directly back of the bregma, we have an example of a high form of , on the contrary, the curves as above defined are sharply indicated Ave have oneof low grade. (13). O
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