238 NEW YORK STATE MUSEUM 
little doubt—then it attained three fourths the length of the carapace. 
The basal segment is broad and massive, three times as long as wide, con- 
tracting slightly at the distal end. The two segments forming the pincers are 
but half as long as the basal segment, broad at the base and furnished with 
very acute, slightly curved tips. In the type of the species [pl. 31] the 
basal segments alone are seen, turned back to their full length; in plate 
32 the pincers and a part of ° 
the basal segments are folded 
backward. 
The walking legs are all 
relatively short but massive 
and are provided throughout 
with very long, stout, curved 
spines. The first pair 1s very 
short and project a little at 
a po the tips beyond the margin of 
a the carapace; the second is 
the longest of the series and 
the following two pairs again 
decrease in size, the third 
being but little shorter than 
Figure gs Outline sketch of the incomplete female the second, while the fourth is 
opercular appendage of the preceding figure, with the shorter by about one third. In 
sutures of the pentagonal pieces and of the sternites ae 
old individuals [pl. 33, fig. 2] 
the spines on the first leg attain one third the length of the whole member. 
The coxa has been seen only in the leg referred to. It is here elon- 
gate, widens toward the base and is about as long as the following seg- 
ment. The distal part is drawn out into a curved neck bearing the man- 
ducatory edge on its inner side. The teeth, which form a decreasing series, 
are long and sharp. Just above the first is a large round scar which may 
be the base of a much larger tooth at the head of the series, such as is 
found in other eurypterids. At the end of the series is a small round node 
