THE EURYPTERIDA OF NEW YORK 415 
convex, the antelateral angles prominent, well rounded; the basal 
margin straight transverse. The lateral eyes are large, a little more than 
one third the length of the carapace, subcircular, situated as stated. The 
type is 4.7 mm long and 5.5 mm wide. 
Stylonurus modestus nov. 
See text figures 99-101 
This species is based on several small carapaces with portions of 
the abdomen and a leg [see text fig. 99] which suggest the following 
description : 
Carapace subrectangular, broad, length to width as 5:8. Lateral 
margins nearly straight, slightly converging forward, anterior margin 
gently emarginate in the middle, posterior margin straight transverse. 
Lateral eyes very large, between one half and one third the length of 
the carapace, circular, situated subcentrally, as far apart as their length 
Basal margin straight transverse. Lateral and anterior margins with a 
broad thick border, probably originating from a doublure on the under- 
side. Body slender, hardly expanding posteriorly and gradually con- 
tracting to postabdomen. One leg [see text fig. 99] observed which appears 
to consist of spineless tubular, striated segments, as in Stylonurus. Length 
of carapace of type [text fig. 99], 5 mm; width, 7.5 mm. 
We have referred this 
species to Stylonurus rather 
than to Eurypterus on account 
of the aspect of the carapace, 
99 Iol 
with its broad border, large 
eyes and broad, subrectangular 
outline; the slender form of the 
Fig. p9-T08 Stylonurus modestus nov. Fig. 00 Holotype. 
body, and the character of the 2. Specimen showing carapace, with broad border, a a 
of walking leg and of abdomen. Fig.100 Small well preserved 
leg which resembles the posterior carapace, showing the subcircular eye nodes. Cotype. x 2. 
Fig. ror Specimen with similar carapace to preceding, broad 
border, large eye nodes, and very slender abdomen. Cotype. 
walking leg of Stylonurus. x2 
