Hughmilleria shawangunk Clarke Page 342 See plates 64–66 1 Carapace showing normal outline and eyes. × 3 Horizon and locality. Shawangunk grit. Otisville, Orange co., N. Y.^[1]

Hardieopterus (Pterygotus) macrophthalmus Hall Page 350 See plates 72–73 2 A nearly complete specimen showing the dorsal view of the preabdomen and postabdomen, the latter distended and exhibiting the membrane connecting the joints; and the telson. Natural size Horizon and locality. Bertie waterlime. Cranes Corners, Herkimer co., N. Y. 3 A young specimen showing the relatively greater size of the compound eyes and ocellar mound. Natural size Horizon and locality. Bertie waterlime. Marshall, Oneida co., N. Y. 4 Dorsal view of three tergites and postabdomen showing the marginal serrations of the ultimate segment and the median carina. Natural size Horizon and locality. Bertie waterlime. Oneida co., N. Y. 5 Young carapace preserving well the outline of the carapace, the form and prominence of the compound eyes and the ocellar mound. × 2 6 Larger carapace. Natural size 7 Specimen showing the carapace, three tergites and swimming legs. Natural size Horizon and locality. Bertie waterlime. Cranes Corners, Herkimer co., N. Y.

All figures are from photographs. The originals of figures 1, 2, 5, 6, 7 are in the State Museum, those of figures 3 and 4 are in the American Museum of Natural History

The Eurypterida of New York. Volume 2. New York State Museum Memoir 14, plate 69