THE EURYPTERIDA OF NEW YORK 277 
Appendages. The swimming leg, the only appendage observed, is 
relatively short, twice as long as the carapace. The coxa and second 
segment have not been seen. The third is short and ring like, the fourth 
tubular, long, slender (two and one half times as long as wide) and slightly 
curved. The next is again shorter (half as long as preceding) and also 
tubular, slightly widening distally. The sixth is of the same length with 
the fifth and elongate pentagonal in outline. Like the following segments 
it bears two broad leaflike spines of greater length than the segment. 
The seventh and eighth segments are of similar length but broader; 
apparently of inverted cuplike outline but obscured by the over- 
lying spines, which give the terminal part of the leg the appearance of 
a bud-bearing twig. The last joint is apparently subdivided into three 
bractlike lobes, the middle of which is the longest. 
No traces of the ornamentation of the test are shown. 
Measurements | millimeters 
Length of carapace.... 0... ccc eee eee Lee ees 10.8 
Greatest Width. ... 0... 0... ccc ee eee teens IO. 2 
Least width... ... cece eee Lee eee ees 8.2 
Length of €yeS. 1... ec ee teen eens 2.4 
Length of first tergite.. 0... ec eee eens I.0 
Width of same... . .. ce ee ee ee eens 8.4 
Length of third tergite... 2... cece ee ees 2.2 
Width of same... 6. ee ee eee eens 9.4 
Exposed length of swimming leg...... 2.0... ee eee eee eee 16.5 
The largest carapace observed measures 
Length of carapace... ... 6. eee ence eee eens 17 
Greatest width... 1... eee eee ee eee eee 16.3 
Least width......... Lene cence ee ene ne eee e teen ens 15 
Length of CYS... eect cece eee nees A 
Horizon and locality. Inthe Shawangunk grit of Otisville, N. Y. 
Observations. We have already noted the stylonuroid features of 
the carapace of this species. The spadelike form of the carapace is also 
