The high cheek-bone and the hawk'sbill nose are universally distributed in the two Americas; so also are proportions between parts of the body, and the frequency of certain abnormalities of the skull, the hyoid bone, the humerus and the tibia.
Present material is such as the Indian tribes of the two Americas are making to-day.
The relation of the Americas to each other and to the rest of the world, as the home of plants and animals, is greatly affected by the breadth of the adjacent oceans, and also by the geologically recent changes of altitude whereby the breadth of the narrower parts of the lands and the oceans has been significantly altered.
About 30 species, mostly of the genus Glauconia, in south-western Asia, Africa, Madagascar, the Antilles and both Americas, G.
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