Page:The Eurypterida of New York Volume 1.pdf/426

 there is plenty of evidence that the eurypterids in these waters of the Shawangunk sea reached considerable size and occurred in great profusion.

The best specimens are identical or very closely related to the following species from Otisville:

1  Clarke. A number of carapaces with the characteristic subtrapezoidal outline. Three of these, at least, show the position of the compound or lateral eyes and the marginal doublures.

2  Clarke. Carapaces with the very uniformly rounded outline of that species but not exhibiting the eyes.

3  cf. Clarke. Its presence is suggested by a patch of integument with the peculiar sculpture of that species. The sculpture resembles especially that of plate 53, figure 2.

4  Clarke. A segment with the characteristic linear sculpture. Also several carapaces are referable to this species.

5  cf. Clarke & Ruedemann. A very small somewhat distorted carapace of a Pterygotus may well represent this species.

Professor van Ingen has also succeeded in discovering still another eurypterid fauna southwest of the Delaware Water Gap, at the Swatara Gap, Lebanon co., Pa. The interesting feature of this fauna is that it occurs in association with marine fossils suggesting horizons lower than the Salina and corresponding to parts of the Niagaran, possibly as low as the Clinton.

Eurypterid remains were encountered in three beds distinguished as: 182 B 16h, 182 B 23 and 182 C 4x.

182 B 16h, an olive gray sandy shale, has furnished:

1 Small carapaces, belonging to species closely related or identical with,   and