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| 1 | Interior view of postabdomen, lacking the last segment. Original of Pterygotus globicaudatus Pohlman. Natural size |
| 2 | Enlargement of anterior portion of a carapace, reproduced in plate 23, figure 1, showing character of ornamentation and margin. Ocellar mound with traces of ocelli in lower left corner. × 3 |
| 3 | Enlargement of posterior portion of the same carapace, to show character of ornamentation. Ocellar mound in front. × 3 |
| 4 | Enlargement of portion of specimen represented in figure 1 to show character of scales on tergite Horizon and locality. Bertie waterlime. Buffalo, N. Y. |
All figures are from photographs, of which the originals are in the museum of the Buffalo Society of Natural Sciences
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