Page:Second Geological Survey of Pennsylvania Report of Progress PPP.djvu/49

 part of the body is across the fourth segment, which is more than three times the width of the last one.

Telson very long, having a length equal to nearly one-half the length of the entire animal.

The palpi and swimming feet are comparatively longer than in the preceding species.

Test marked by minute imbricating scales. On the posterior tergal position of the carapace and somites the scales are larger than on the other portions of the surface.

A somewhat distorted specimen has a length of 99 mm., of which 49 mm. pertain to the telson; the width of the fourth somite is 22 mm. and of the last one 7 mm.

This species is distinguished from E. Mansfieldi by its shorter carapace, comparatively wider body, longer and stronger telson and the eyes are more oblique and distant.

Formation and locality.—Found in the shale immediately below the Darlington cannel coal, near Cannelton, Darlington township, Beaver county, Pennsylvania. Horizon, Alleghany river series.