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 quite probably represents a distinct species; on account of the rather unsatisfactory preservation of the single carapace representing it, we have refrained from naming it.

was of fairly large size. The carapace selected as type is 38 mm wide and 39 mm long.

Sarle. N. Y. State Palaeontologist Rep't. 1902. p. 1105, pl. 26, fig. 2–4

Mr Sarle collected from the Pittsford shale a group of endognathites that present characters quite different from those of the associated species. He gave an elaborate description of the fragments but was unable to refer them to any of the genera of eurypterids and therefore suggested that "with more perfect material the forms will be found to represent a new genus."

Our entire specimen of  from Otisville furnishes the clue to these organs, in showing that the longest endognathite of the group corresponds to the third pair in Stylonurus, subgenus Ctenopterus. The general form and the relative dimensions of the parts of this endognathite are quite precisely those of Stylonurus. We infer from these facts that the fragments indicate the presence of a fairly large species of Stylonurus in the Pittsford shale. As this form is recognizable from the figured parts, we venture to name it.

Sarle's description of the fragments is as follows:

An eurypterid differing very materially from anything described from the Bertie waterlime, is represented in the collection by a group of four incomplete arms and a body segment, and by another of two incomplete arms.

In the first group [ pl. 50, fig. 10] the longest of the arms has the coxal and succeeding five joints preserved. These are long, measuring altogether 110 mm in length. The three distal bear a series of long, curved spines. The form of the coxal joint is subtrapezoidal, the anterior side being