Hardieopterus (Stylonurus) myops Clarke Page 300 See plates 51, 53 1–4 Paratypes showing normal expressions of the carapace. Natural size 5 Young carapace with abnormally round outline and anterior eyes. × 3 6 The only entire specimen observed, dorsal view. Much compressed and poorly preserved. Natural size 7 Type. Carapace and two tergites. Carapace exfoliated; tergites showing the ornamentation. × 3 8 Interior view of carapace showing the broad doublure. × 3 9 Specimen showing a median prolongation in front. × 3 10 The holotype. × 3 11 Interior view of laterally compressed carapace showing frontal marginal row of tubercles. × 3 12 Detached visual area. × 5. The radial lines are wrinkles 13 Compound eye showing semioval form of ocular node and its ornamented surface. Paratype. Natural size 14 Central portion of figure 4 enlarged (× 3) to show form of ocellar mound and extent of visual areas Horizon and locality. Shawangunk grit. Otisville, Orange co., N. Y.