Page:Second Geological Survey of Pennsylvania Report of Progress PPP.djvu/53



A large specimen preserving the carapace, abdomen and telson nearly entire, with three of the palpi of the left side. A portion of the test is removed along the median line exposing the process of the epistoma or median appendage of the thoracic plate. This figure shows very satisfactorily the mode of occurrence and association of these fossils.

The abdomen and telson of a specimen as it is seen lying in the shale. Heliotyped directly from a plaster cast of the specimen.