﻿PLATE III. 



DEVONIAN CRUSTACEA. 



Order — Merostomata. 

 Sub- Order — Eurypterida. 



Fig. 



1. A metastoma or post-oral plate of Pterygotus anglicus, Ag\, figured of the natural 



size, from the Devonian of Forfarshire. See page 39. 



2. Antepenultimate body-segment (corresponding in position to the segment marked a 



in fig. 1, Plate I) ; the upper surface is here represented of the natural size. 



From the Devonian of Forfarshire. See page 42. 



The original specimens are preserved in the British Museum. 



