Page:Eurypterids of the Devonian Holland Quarry Shale of Ohio.djvu/7

. They do so in parts of the Upper Silurian of New York, where the various specific ranges are well known.

The list of North American eurypterids of the Devonian is as follows:

The ecological conditions are discussed by Dr. Denison in his paper on fishes (1960, p. 610) and will not be repeated here.

This large eurypterid is the most common element of the Lower Devonian eurypterid fauna of Lucas County. Most of the patches