from The Century Dictionary and Cyclopedia
- In anthropology, having a skull with a facial index of 90 and over. See leptoprosopic.
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The expressions euryprosopous and euryonic correspond to the chamaeconchous of the Frankfort Agreement; leptous is the same as leptoprosopous.
He supposed six sub-species: chamaeprosopous dolichocephalic, chamaeprosopous mesocephalic, chamaeprosopous brachyhcephalic, leptoprosopous dolichocephalic, leptoprosopous mesocephalic, leptoprosopous brachycephalic.
The ratios of the breadth of the zygomatic arch (supposing it equal to 100) to the height of the entire face (from the nasion to the gnathion), and to the height of the upper face (from the nasion to the prosthion), give facial indices which are divided by R. Martin into the following groups: (1) Index for the entire face: hypercuryprosopous (to 79.9), curyprosopous (80.0 to 89.9), leptoprosopous (90.0 to 94.9), hyperleptoprosopous (over 95.0).