2.1" Primitive Horseshoe Crab (Protolimulus) Fossil - Pennsylvania

This is a very rare, 2.1" long primitive horseshoe crab fossil (Protolimulus eriensis) that was collected from the Upper Devonian, Venango Formation of Erie County, Pennsylvania. Only a very small number of these were collected from a now inaccessible site and this one comes out of an old collection we recently acquired.

A description of this species from 1938 is linked below.

Note on the Xiphosuran, Protolimulus eriensis Williams