| 1 | Carapace showing distinctly the extent of the visual areas which are broken out, and the ocellar mound. × 3 |
| 2 | Carapace showing the frontal tumescence and large ocellar mound. × 3 |
| 3 | Carapace showing surface ornamentation. The doublure has become separated on the left side. × 3 |
| 4, | 5, 6 Carapaces illustrating the great variation in outline due to different directions of compression. × 3 |
| 7 | Portion of a grooved leg, probably belonging to this species. Natural size Horizon and locality. Shawangunk grit. Otisville, Orange co., N. Y. |
Stylonurus sp.
| 8 | Fragment of leg, probably referable to Stylonurus, subgenus Ctenopterus. × 3 Horizon and locality. Shawangunk grit. Otisville, Orange, co., N. Y. |
Stylonurus multispinosus nov.
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| 9 | Distal portion of leg. Natural size |
| 10 | Group of first and third endognathites, and a sternite Horizon and locality. Pittsford shale. Pittsford, Monroe co., N. Y. |
The originals of all figures are in the State Museum
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