to be of uniform length and slender when compared with those of other species of Eurypterus. It seems hence, that in this species, not only the two usual spines at the distal edge are present, but also that the rudimentary spines at their bases, seen in other species and one or more accessory spines have grown out to the full size of the first pair.
The swimming legs are equally distinct from those of the associated Eurypteri in several features. The coxa is distinctly broader, corresponding to the great basal width of the carapace. Its length and width are subequal. The second and third segments are annular.[1] The fourth, fifth and sixth are notably stronger and wider than in E. fischeri and remipes, though not differing otherwise, while the seventh is remarkably short and wide, having the general form of the corresponding segment of E. lacustris var. pachychirus, but being much smaller relatively to the whole leg. The eighth segment also, forming with the seventh, the oar blade, is notably smaller than in other species. The terminal, rudimentary segment, as already remarked by Hall is a little larger than in E. lacustris.
The metastoma is like that of E. lacustris. The female and male appendages, seen in these specimens, do not appear to differ from those of either E. lacustris or E. remipes except that the terminal paired lobes in the female appendage are shorter than in E. lacustris and correspond to those of E. fischeri or remipes.
Ornamentation. Only interior views of the integument have been obtained and hence the character of the ornamentation has remained unobserved, except for the two converging rows of spines on the postabdominal segments and a few traces of subtriangular scales, indicating a sculpturing very much like in E. fischeri.
Measurements. The carapace of the type is 31 mm long and about 58 mm wide; that of the hypotype measures 33 × 55 mm; the eyes of the latter are 6.8 mm long. The preabdomen of the type measures 40.4 × 71 mm, both measurements being but approximate on account of
- ↑ The third was overlooked by the draftsman of the original drawing.
