Publisher's Synopsis
Excerpt from Ceratiocaridae; Eurypteridae From the Upper Devonian Measures in Warren County; From the Lower Productive Coal Measures in Beaver County, Lower Carboniferous, Pithole Shale, in Venango County
In the use of descriptive terms for the different mem bers of these crustaceans, it has been deemed advisable to adhere to the established nomenclature, with perhaps a few slight introductions and variations. The terminology used is explained by the following diagram.
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