Journal of the Academy of Natural Sciences of Philadelphia . , con-vexity at the nasal salient. The distal end projects beyond the line of theanterior nasal spine, though in less degree than in No. 1,228, Absaroka. Theincisor eminence is marked, thealveolar line nil. The incisor crestand spine large. The skull is phox-ocephalic. (3). The orbit. The superiormargin of the orbit is describedas the orbital arch in text truth it is rarely an arch. Inthis essay it will be assumed that anoblique line is present, which extendsfrom the supra-orbital notch to theend of the external lateral proc
Journal of the Academy of Natural Sciences of Philadelphia . , con-vexity at the nasal salient. The distal end projects beyond the line of theanterior nasal spine, though in less degree than in No. 1,228, Absaroka. Theincisor eminence is marked, thealveolar line nil. The incisor crestand spine large. The skull is phox-ocephalic. (3). The orbit. The superiormargin of the orbit is describedas the orbital arch in text truth it is rarely an arch. Inthis essay it will be assumed that anoblique line is present, which extendsfrom the supra-orbital notch to theend of the external lateral process,and which constitutes the outer partof the orbital arch, and that thecurved surface answering to the spacefrom the same notch to the end ofthe internal angular process is the inner part of the orbital arch. The two parts are distinct in range of variationand in morphological significance. The inner part is found in all mammals, whilethe outer part is confined to the relatively few genera in which the orbit is limited, 52 JOURN. A. N. S. PHILA., VOL. (Norma lateralis.)Fig. 13.—Kootenay. 1,227. 416 CRANIA FROM THE MOUNDS OF FLORIDA. in the main, by a process of the frontal bone (external lateral process), and whichseparates the orbit from the temporal fossa. The outer part of the orbital arch ismuch inclined downward and outward in leptoprosopic, and is nearly horizontal inchamaeprosopic crania. The shades of distinction in specimens are so numerous,however, that they should constitute part of the description in many skulls. The theorem of a stout supra-orbital ridge being associated with a highdegree of muscular power in the individual has been maintained by I have inferred that no direct correlation can exist between factors so farremoved from one another. The inner orbital wall relates to the ethmoid bone, the lachrymal bone andthus directly to the nasal chamber; the outer wall to the temporal fossa,/while thelower is described with the maxilla. The
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