Pterygotus sp.
| 1–4 | Apparently distal portion of the female opercular appendage of a Pterygotus. Natural size |
| 5 | Small, well preserved telson. Natural size |
| 6 | Ultimate postabdominal segment. Natural size |
| 7 | Telson with distinct coarse marginal serrations. Natural size |
| 8 | Fragment of appendage, apparently telson of an Erettopterus, with distinct marginal serrations and a peculiar ornamentation. Natural size |
| 9 | Fragment of segment with ornamentation suggestive of Pterygotus. Natural size Horizon and locality. Lower Siluric: Schenectady shale. The originals of figures 1–4 are from the Crumby quarry, Aqueduct, that of figure 5 is from Duanesburg, those of figures 6–8 from the Dettbarn quarry, Schenectady and that of figure 9 from Rotterdam Junction. |
All originals are in the State Museum
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