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

rences. 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:

Adelophthalmus approximatus (Hall and Clarke)	Upper Devonian?	Pennsylvania
Ctenopterus (?) lacoana (Claypole)	Upper Devonian	Pennsylvania, New York
Dolichopterus asperatus, n. sp.	Lower Devonian	Ohio
Dorfopterus angusticollis Kjellesvig-Waering	Lower Devonian	Wyoming
Erieopterus latus (Ruedemann)	Lower Devonian	Wyoming
Grossopterus inexpectans (Ruedemann)	Middle Devonian	New York
Pterygotus (Erettopterus) serratus n. sp.	Lower Devonian	Ohio
Pterygotus (Pterygotus) atlanticus Clarke and Ruedemann	Middle Devonian	New Brunswick
Pterygotus (Pterygotus) carmani n. sp.	Lower Devonian	Ohio
Pterygotus (Pterygotus) elleri Ruedemann	Upper Devonian	New York
Pterygotus (Pterygotus) gaspensis Russell	Middle Devonian	Quebec
Pterygotus (Pterygotus) howelli Kjellesvig-Waering and Størmer	Lower Devonian	Wyoming
Pterygotus (Pterygotus) montanensis Ruedemann	Upper Devonian	Montana
Rhenopterus (?) maccarthyi (Kjellesvig-Waering)	Middle Devonian	New York
Strobilopterus princetonii (Ruedemann)	Lower Devonian	Wyoming
Stylonurus arnoldi (Ehlers)	Upper Devonian	Pennsylvania
Stylonurus beecheri (Hall)	Upper Devonian	Pennsylvania
Stylonurus (?) wrightianus (Dawson)	Upper Devonian	New York
Syntomopterus richardsoni, n. sp.	Lower Devonian	Ohio

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

Class Merostomata Dana, 1852
Subclass Eurypterida Burmeister, 1843
Superfamily Eurypteracea Burmeister, 1845
Family Pterygotidae Clarke and Ruedemann, 1912
Genus Pterygotus Agassiz, 1839

Pterygotus (Pterygotus) carmani, new species
Figures 35–42

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