Systematic Review of Our Present Knowledge of Fossil Insects, Including Myridpods and Arachnids

U.S. Government Printing Office, 1886 - 128 Seiten

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Seite 34 - The thorax is composed of three segments, each of which bears a pair of legs and each of the hinder two a pair of wings, which, especially the posterior, are occasionally aborted.
Seite 104 - ... from the existing orders under the name of Palaeodictyoptera — a term first proposed by Goldenberg in lieu of Dohrn's preoccupied Dictyoptera, which had been suggested for an order typified by the Permian Eugereon. This order is defined more by the generalized characters of its various members, and the lack of those special characteristics which are the property of existing orders, than by any definite peculiarities of its own.

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