| 1 | Interior view of carapace showing very distinctly the facettae of the lateral or compound eyes [see fig. 2]; also the ornamentation of the coxal joint. Natural size |
| 2 | Enlargement (× 3) of one of the eyes |
| 3 | Pincers of chelicera. Original of text figure 1425 in Zittel-Eastman's Textbook of Paleontology. Natural size |
| 4 | Another pair of pincers or chelae showing a complete fixed chela. Natural size |
| 5 | Telson; of type of "P. acuticaudatus" Pohlman. Natural size |
Pterygotus cobbi Hall
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| 6 | Free pincer or chela of chelicera. Cotype of P. cummingsi Grote & Pitt [fig. p. 301, Am. Ass'n Adv. Sei. Proc., v. 26, 1878]. Natural size Horizon and locality. Bertie waterlime. Buffalo, N. Y. |
All figures are from photographs.
The originals of figures 1–3 and 5 are in the State Museum, those of figures 4 and 6 in the museum of the Buffalo Society of Natural Sciences
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