Pterygotus macrophthalmus Hall
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See plate 69, fig. 2–7; plate 71
| 1 | Ventral view of a nearly entire specimen showing the operculum with female genital appendage and the other sternites, a swimming leg, a detached distal portion of a chelicera and the long, club-shaped basal joint of another |
| 2 | Well preserved telson of a larger individual showing the elongate form. Natural size Horizon and locality. Cranes Corners, Herkimer co., N. Y. |
Pterygotus monroensis Sarle
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| 3 | Fragment of free pincer or chela probably belonging to this species. Natural size |
| 4 | Metastoma, probably belonging to this species. Natural size |
| 5 | The type. Carapace. Natural size Horizon and locality. Pittsford, Monroe co., N. Y. |
Pterygotus? sp.
| 6 | Fragment of carapace, probably belonging to Pterygotus. Natural size |
| 7 | Distorted carapace of a Dolichopterus or Pterygotus. Natural size |
| 8 | Telson of a Pterygotus. Natural size Horizon and locality. McKenzie formation (Basal Cayugan period of Upper Siluric). Near Hancock, Md. |
The originals of figures 1–5 are in the State Museum, those of figures 6–8 in the National Museum
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