250 NEW YORK STATE MUSEUM 
fragment of a flat-topped carina such as is found in the other eurypterids, 
suggesting that the section of the telson does not differ materially from 
that in other genera. No traces of marginal serrae are observable in our 
specimens. 
Appendages. What appear to be the tips of the chelicerae or preoral 
appendages are seen in the largest specimen, the chelicerae having there 
remained in normal position. If this view 1s correct, these appendages | 
were relatively large and strong. 
The ectognathites or walking legs are here developed into stout and 
_long organs which, except for the first pair, protrude far beyond the cara- 
pace and by their width give the impression of great strength and import- 
ance. This impression is still more emphasized by the great length of their 
curved spines. The first leg was the shortest, only its last two segments 
and their spines protruding. The second walking leg which is the longest, 
is exposed with six segments outside of the carapace; its exposed portion 
equals the carapace in length. The segments in this pair of appendages are 
about as long as wide; in the following legs they become increasingly 
shorter. The spines attain about one fourth the length of the ectogna- 
_thites, the terminal clawlike spine being the longest and the others decreas- 
ing in proximal direction. Each exposed segment bears two spines of appar- 
ently somewhat different length which all curve inward. Of the next 
swimming leg about one segment less protrudes and the segments are also 
shorter, the exposed part being thereby shorter by one sixth than that of the 
preceding leg. The fourth pair is shorter than the second by at least one 
third; its segments, however, are broader than long by about one third, so 
that again five segments protrude. 
The swimming legs are distinguished by great length and width; 
turned back they reach the beginning of the narrow part of the postab- 
domen (line of third postabdominal segment). The coxae of the legs 
have been seen only in outlines too faint and obscure for exact descrip- 
tion. One of these is indicated on plate 38. The manducatory edges which 
~ are the most resistant parts of the gnathobases are also seen on plate 37, 
