88 NEW YORK STATE MUSEUM 



The differentiation between dorsal and ventral color marking is 

 lost in the latter forms, both sides being equally exposed to light 

 and sight. 



Bibliography 



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p. 346, pi. 27, fig. 6 



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5 A new Eurypterid from the Devonian of New York 



The Devonian of New York has thus far afforded but extremely 

 scanty remains of eurypterids, and these are referable to two species, 

 apparently all of the genus Stylonurus. These are the Portage form 

 Stylonurus (?) wrightianus (Dawson), represented 

 only by a leg joint, and the Catskill form Stylonurus (Cten- 

 o p t e r u's) excelsior Hall. If we add to this the other Cats- 

 kill species S. beech eri (Hall), from Warren, Pa., known only 

 from an abdomen and leg and the Pterygotus atlanticus 

 Clarke and Ruedemann, from the Devonian of New Brunswick, 

 based on some fragments of appendages, the list of the eurypterid 



