THE EURYPTERIDA OF NEW YORK 311 
latter lacks the carapace and the first four pairs of legs, its relation to the 
subgenera distinguished above, can not be determined. 
The specimen serves to demonstrate the persistence of the genus 
Stylonurus into late Devonic time, the type coming from the Chemung 
sandstones at Warren, Warren co., Penn. 
Stylonurus (?) wrightianus (Dawson) 
(Text figure 68) - 
Equisetides wrightiana Dawson. Quar. Jour. Geol. Soc. 1881. 37:301, 
pl. 12, fig. 10; pl. 13, fig. 20 
Equisetides wrightiana Wright. N. Y. State Mus. Nat. Hist. 35th Rep’t. 
1884. p. 196 
Stylonurus(?) wrightiana Hall. Ibid. pl. 15, note 
Echinocaris wrightiana Jones & Woodward. Geol. Mag. 1884. Dec. 3; 1: 
9; P. 393, pl. 13, fig. 1, a, b 
Echinocaris wrightiana :Etheridge, Woodward & Jones. 3d Rep’t Com- 
mittee on Fossil Phyllopoda of the Palaeozoic Rocks. 1885. p. 35 
~Stylonurus(?) (Echinocaris?)wrightianus Hall&Clarke. Palacon- 
tology of New York. 1888. 7: 160, pl. 27, fig. 7-9 
Stylonurus(?) wrightianus Beecher. American Journal of Science. rIgoo. 
10: 148 
_ The foregoing synonymy reveals the interesting history of a two jointed 
subcylindrical fragment from the lower beds of the Portage sandstones, 
Italy, Yates co., N. Y. Originally regarded as of vegetable nature, Hall 
early recognized that its surface sculpture was that of an arthropod 
and that it probably represents “‘two of the abdominal segments of 
a form not unlike Stylonurus.’’ Woodward and Jones then referred the 
fragment to the Phyllocarida (Echinocaris), evidently basing their opinion 
on the spinose character of the surface of the fragment. Hall and Clarke 
later pointed out that no species of that genus possess spines of similar 
character to those in the specimen and that the latter would be gigantic 
for Echinocaris but not for a species of Stylonurus. Finally Beecher 
suggested that the specimen represents two proximal segments of one of 
