THE EURYPTERIDA OF NEW YORK 313 
have afforded, fragmentary remains indicate the presence of several other 
representatives of the same genus, which for the sake of completeness, 
may be mentioned in this place. 
a. Plate 53, figures 8, 1ro-12. One of these is characterized by its 
acutely triangular scales, which assume the aspect of short sharp spines 
and actually seem to have consisted of such in the specimen, figure ro, 
where the fact that the distal parts of the scales are always broken off, is 
evidence of their spinose nature. The fragments of segments indicate that 
these possessed distinct anterior and posterior borders. A single segment 
of one of the first or second pairs of legs has been obtained. This by its 
lateral row of spines permits a reference of the species to the subgenus 
Ctenopterus. 
B. Plate 53, figures 14, 15. A second species, quite probably also 
referable to Ctenopterus, is best represented by the leg segment repro- 
duced in figure 15. This shows a series of teethlike serrations, quite dis- 
similar to the rows of spines in other species. 
-y. Plate 53, figure 19. A third leg segment, also possessing the char- 
acteristics of Ctenopterus, shows broad, flat (paired?) spines with longi- 
tudinal striae; these features strongly reminding one of the leg spines of 
S. excelsior. | 
8 Plate 53, figures 6, 9. Some patches of integument bear a 
sculpturing which consists of flat, broad, distinctly separated promi- 
nences and in part of long ridges, the whole resembling a cobblestone pave- 
ment. This is so strikingly different from all other ornamentation 
observed in the beds at Otisville, that it can not fail to characterize its 
possessor. It is more suggestive of the ornamentation exhibited by such 
forms as 8. excelsior, scoticus and myops than of members 
of other genera. 
some other specifically indeterminable fragments deserving mention, 
may be noted here. One of these is the distal portion of one of the posterior 
legs [pl. 53, fig. 20] of a Stylonurus, chiefly remarkable for its size, indicating 
the presence of large individuals of the genus in this Otisville fauna. Another 
