| 1 | Complete fixed pincer or chela of chelicera. Natural size |
| 2 | Fragment of fixed pincer showing the teeth. Natural size |
| 3 | Part of ventral marginal shield and epistoma. × 2 |
| 4 | Tergite. Natural size Horizon and locality. Bertie waterlime. Cranes Corners, Herkimer co., N. Y. |
| 5 | Serrations of tooth of chela. × 3 Horizon and locality. Bertie waterlime. Jerusalem hill, Herkimer co., N. Y. |
| 6 | Ventral view. Hall's type of P. osborni. Shows the walking legs and metastoma. Natural size Horizon and locality. Bertie waterlime. Waterville, Oneida co., N. Y. |
| 7 | Coxal joint of swimming leg. Natural size Horizon and locality. Bertie waterlime. Litchfield, Herkimer co., N. Y. |
| 8 | Group of appendages showing a well preserved walking leg, a metastoma and coxal joint of swimming leg. Natural size Horizon and locality. Bertie waterlime. Cranes Corners, Herkimer co., N. Y. |
| 9 | Fragment of integument showing the characteristic form of the scales. × 2 Horizon and locality. Bertie waterlime. Jerusalem hill, Herkimer co., N. Y. |
| 10 | Telson of a young individual. Natural size Horizon and locality. Bertie waterlime. Cranes Corners, N. Y. |
All figures are from photographs.
The originals of figures 1–5, 8–10 are in the State Museum; those of figures 6 and 7 in the American Museum of Natural History
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