American Permian Vertebrates


It is now evident that not only amphibians, but also reptiles with considerable diversity of habits and structure, arose in several parts of the world before the close of the Carboniferous period. It is thus becoming more and more difficult to interpret the relationships of the numerous genera—even those known by complete skeletons—which have already been described from the Permian rocks of Europe, North America, Brazil, and South Africa.

American Permian Vertebrates.

Prof. S. W. Williston. Pp. v + 145 + 38 plates. (Chicago, III.: The University of Chicago Press; Cambridge [Eng.]: University Press, n.d.) Price 10s. net.

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