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, contracting 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 
Figure 55 Outline sketch of the incomplete female opercular appendage of the preceding figure, with the sutures of the pentagonal pieces and of the sternites 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 is very short and project a little at the tips beyond the margin of 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 the second, while the fourth is shorter by about one third. In 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 elongate, widens toward the base and is about as long as the following segment. The distal part is drawn out into a curved neck bearing the manducatory 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
