THE EURYPTERIDA OF NEW YORK 183 
to be of uniform length and slender when compared with those of other 
species of Eurypterus. It seems hence, that in this species, not only the 
two usual spines at the distal edge are present, but also that the rudi- 
mentary spines at their bases, seen in other species and one or more 
accessory spines have grown out to the full size of the first pair. 
The swimming legs are equally distinct from those of the associated 
Eurypteri in severalfeatures. The coxa is distinctly broader, corresponding 
to the great basal width of the carapace. Its length and width are subequal. 
The second and third segments are annular.'. The fourth, fifth and sixth 
are notably stronger and wider thanin E. fischeri and remipes, 
though not differing otherwise, while the seventh is remarkably short and 
wide, having the general form of the corresponding segment of E. lacus- 
tris var. pachychirus, but being much smaller relatively to the 
whole leg. The eighth segment also, forming with the seventh, the oar blade, 
is notably smaller than in other species. The terminal, rudimentary segment, 
as already remarked by Hall is a little larger than in E. lacustris. 
The metastoma is like that of E. lacustris. The female and 
male ‘appendages, seen in these specimens, do not appear to differ from 
those of either E. lacustris or E. remipes except that the 
terminal paired lobes in the female appendage are shorter than in 
E. lacustris andcorrespond to those of E. fischeri or remipes. 
Ornamentation. Only interior views of the integument have been 
obtained and hence the character of the ornamentation has remained 
unobserved, except for the two converging rows of spines on the post- 
abdominal segments and a few traces of subtriangular scales, indicating a 
sculpturing very much likein E. fischert. 
Measurements. The carapace of the type is 31 mm long and about 
58 mm wide; that of the hypotype measures 33x 55 mm; the eyes of 
the latter are 6.8 mm long. The preabdomen of the type measures 
40.4% 71 mm, both measurements being but approximate on account of 
1The third was overlooked by the draftsman of the original drawing. 
