| 1 | The coxal joint of a swimming foot of a gigantic specimen, probably of this species. Type of P. cummingsi Grote & Pitt. Natural size |
| 2 | Metastoma of a large individual showing the ornamentation. Natural size Horizon and locality. Bertie waterlime. Buffalo, N. Y. |
Pterygotus atlanticus nov.
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| 3 | Free chela, imperfect at both extremities. Natural size |
| 4 | Gnathobase of coxa of swimming leg. The acute body resting upon it, is a fish spine. Natural size |
| 5 | Fragment, apparently the posterior portion of a metastoma. Natural size Horizon and locality. Dalhousie beds (Devonic). Campbellton, New Brunswick |
The originals of figures 1 and 2 are in the museum of the Buffalo Society of Natural Sciences, those of figures 3–5 in the Canadian Survey Collection at Ottawa
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