THE EURYPTERIDA OF NEW YORK 297 
pace 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. 
S. limbatus was of fairly large size. The carapace selected as 
type is 38 mm wide and 39 mm long. 
Stylonurus (Ctenopterus) multispinosus nov. 
Plate 50, figures 9, 10 
Unknown Eurypterid (genus?) Sarle. N. Y. State Palaeontologist Rep’t. 
1902. p. 110s, 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 Stylonurus cestrotus from Otis- 
_ ville furnishes the clue to these organs, in showing that the longest en-. 
dognathite of the group corresponds to the third pair in Stylonurus, sub- 
genus 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 re- 
cognizable 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 incom- 
plete arms. | 
In the first group [pl. 50, fig. ro] the longest of the arms has the coxal 
and succeeding five joints preserved. These are long, measuring altogether 
rTo 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 
