| 1 | Dorsal view of a nearly complete specimen showing the general form of the body with walking and swimming legs; on the left side also the relative extension of the six tergites and five sternites. The numerous bilobed markings on the surface of the body are the impressions of ostracods which were in the habit of seeking shelter under and within the cast skins of the eurypterids. Natural size |
| 2 | Portion of counterpart of the same specimen, showing the radiating wrinkles of the cornea of the compound eyes. Natural size |
| 3 | Telson of a larger specimen showing the normal outline. Natural size Horizon and locality. Bertie waterlime. Buffalo, N. Y. |
Figures 1 and 3 are from photographs.
The original of figure 1 is in the National Museum; that of figure 2 in the museum of the Buffalo Society of Natural Sciences, and that of figure 3 in the State Museum
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