THE EURYPTERIDA OF NEW YORK 215 
about 52 mm longeach. Judging from the size of the genital appendages 
(in specimen 12909 University of Chicago) all specimens before us are of 
mature age and the species probably did not reach a much larger size than 
that exhibited by the largest specimen before us. This attained a length of 
125 mm to the base of the telson (which is but partly preserved), to which 
may be added at least 34 mm for the telson, giving a total length of 
159 + mm, to which corresponds a greatest width of 50.5 mm, a figure 
clearly exaggerated by the strong flattening of the specimen. The cara- 
pace measures 33.7 x 40 mm. The eyes were about 7.6 mm long and 
the amount of their length distant from the margin. The limbs appear 
very small in this specimen; the swimming legs extending but 44 mm 
beyond the lateral margin of the carapace. 
Horizon and locality. Noblesville waterlime at Kokomo, Indiana. 
Remarks. The material before us consists of four specimens, three 
from the museum of Chicago University, among these the type, and one 
from the collections of the State Museum. The type specimen is excep- 
tionally preserved for Kokomo eurypterids. It exhibits all details of 
structure but the original figure does not do it justice as the specimen had 
not then been worked out nor the extremities of the limbs, among them 
the curious spines of the paddles, exposed. For these reasons this specimen 
has been refigured [pl. 25, fig. 1] and a drawing added of one of the 
other specimens [pl. 25, fig. 2] which shows the faint outlines of the eyes, 
and is remarkable for its size and exhibits well the terminal spines of the 
paddles. The third specimen is entirely unique in its preservation [pl. 26, 
fig. 2]. As shown in the reproduction, the gill plates are preserved as 
thick, black, roughly surfaced blotches, while the whole specimen appears 
as hardly more than a color stain. We have more fully referred to this 
specimen in the general remarks on Eurypterus. The doublures of the 
segments also come out with remarkable distinctness as dark bands and 
the female opercular appendage is distinctly set off from the darker back- 
ground. The sutures of the basal plates of this appendage are barely 
discernible. : 
