﻿PLATE XXV. 



CARBONIFEROUS CRUSTACEA. 



Order — Merostom ata . 



Sub- Order — Eurypterida. 



Fig. 

 1. Eurypterus Scouleri, Hi'obert. (P. 133.) 



1 a. Dorsal aspect of head-shield (natural size), showing position of great subcentral 

 eves. 



1 h. The peculiar ornamentation of the posterior border of head (enlarged). 



1 c. The under side of head exposing a, a, the bases of the ectognaths and t, t, the 

 thoracic plate ? or operculum, thrust forward out of its natural position behind 

 the mouth, so as to be found overlapping it in its present abnormal position. 

 (See p. 136, and Woodcut, Eig. 41.) 



Erom the Freshwater Limestone, Lower Carboniferous, Bnrdie House, 

 near Edinburgh. 



Coll. of James Powrie, Esq., F.G.S., Reswallie. 



