The Eurypterida of New York/Volume 2/Explanations of plates/Plate 82

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Plate 82

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PLATE 82

Pterygotus (Erettopterus) globiceps nov.
Page 374

1	Nepionic stage showing the enormous size of the lateral eyes, the position of the ocelli and the small number of segments. × 30
2	Another larval specimen showing slightly different form of carapace, thickened rim of eyes and small number of segments of tapering abdomen. × 30
3	An older (neanic) stage in which the abdomen has assumed the proportion and composition of the adult stage. A broad thickened rim surrounds the eyes. × 12
4	Carapace of a young individual showing somewhat different characters, apparently due to compression in longitudinal direction. × 15
5	Fragment of carapace of young individual, showing the smooth cornea of the eyes partly separated from the facettae. × 5
6	Well preserved carapace. Type of the species. × 3
7	Largest carapace observed. Shows the lateral eye, somewhat distorted by oblique compression (indicated by the wrinkles) and the ocelli. On the antelateral corner a fragment of the marginal shield of the ventral side with traces of ornamentation is seen. Natural size
8	Tergite showing antero-lateral lobes and ornamentation. × 3
9	Second sternite with genital appendage of young female. × 3
10	Swimming leg. Natural size

Pterygotus (Erettopterus) sp.

11	Portion of a telson showing fine bristles on the margin. Natural size
12	Telson of young individual. × 3

The figures 8, 10, 11 are referred with doubt to this species.

Pterygotus? sp.

13	Problematical fossil, possibly the female genital appendage of a Pterygotus [cf. similar appendage of Pterygotus anglicus, Huxley and Salter, pl. 3, fig. 4, 5, 7]. Horizon and locality. Shawangunk grit. Otisville, N. Y.

The originals are the State Museum