THE EURYPTERIDA OF NEW YORK 365 
species. The barbs are quite distinct in specimen, plate 77 figure 3 and 
still better shown in the fragment reproduced in plate 74, figure s. 
They are broad and low near the point of the teeth and become sharp 
and narrow near its base. Between the larger teeth more numerous and 
much smaller denticles are everywhere intercalated. The movable ramus 
carries in its basal part two (in the younger) or three (in the older indi- 
viduals) stronger teeth directed forward and an irregularly alternating 
series of mostly smaller teeth on the other parts. The latter all stand 
vertical in the jaw. One of them surpasses the others in length and is 
flanked by a group of teeth of about half its length. The edges of these 
are smooth. All teeth are longitudinally striated. The specimen, plate 77, 
figure 3, shows apertures near the base of the teeth on the movable 
ramus. 
The walking legs or endognathites are not very well displayed in our 
material; and the basal segments fail in allsave one specimen [pl. 57, fig. 3]. 
In the latter the coxae even retain the epicoxites in position, the only 
case observed in the entire eurypterid material at our disposal. The coxa 
is slender, with a sigmoidal curvature and the manducatory edge carries 
a series of about nine teeth. The first two segments appear to be 
short, ringlike. The legs are slender and relatively longer in this species 
than in most of its allies, attaining twice the length of the cephalo- 
thorax; smooth, cylindrical and tapering regularly toward the blunt 
spine forming the last joint. The middle segments were longer than 
both the basal ones and the last. The four pairs do not seem to have dif- 
fered materially in length. 
The swimming legs were relatively slender and small extending but 
little beyond the posterior margin of the third tergite in the older. The 
coxa is of enormous size in relation to the remainder of the leg. It 
is half as long as the latter, less the small paddle, and its expansion 
covers half the underside of the carapace [pl. 78, fig. 2]. Its principal part 
is rectangular in outline, the interior and posterior sides nearly straight 
and the others convex, the outer side having a deep sinus in the middle 
