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 Committee on Fossil Phyllopoda of the Palaeozoic Rocks. 1885. p. 35
Stylonurus (?) (Echinocaris?) wrightianus Hall & Clarke. Palaeontology of New York. 1888. 7: 160, pl. 27, fig. 7–9
Stylonurus (?) wrightianus Beecher. American Journal of Science. 1900. 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
