New Eurypterid from Ujrper Coal-measures of Radstoch. 445 



part of the animal to which they had belonged was not 

 clearly demonstrable. 



A peculiar interest centres in this specimen, owing to its 

 occurring in the highest Coal-measures of this country, and 

 is found along with plants which, on the Continent, pass 

 up into the Permian beds. This, therefore, shows that 

 Eurypterids, as such, probably survived till the end of the 

 Palaeozoic period. 



Dimensions of Carapace. 



Greatest length, 



Greatest width, ...... 



Width across central eyes, .... 



Distance of central eyes from posterior margin, 

 Long axis of central eyes, .... 



Distance of compound eyes from posterior margin, 

 Distance of compound eyes apart, . 

 Longer diameter of compound eyes, 

 Shorter diameter of compound eyes, 

 Width of flange as seen on left side, 



Description of Plate XX. 



Fig. 1. Carapace of Glyptoscorpius Kidstoni, natural size. 



Fig. 1«. Diagrammatic view of under side, natural size. 



Fig. lb. Diagrammatic view of fig. 1, magnified to show eyes and nature of 

 ornamentation. The shaded portion shows where the dorsal portion of the 

 test has broken away, so as to expose a cast of under surface. 



Fig. Ic. Diagrammatic section across eyes, to show the arching of back and 

 folding in of carapace at edges. 



Fig. Id. Ditto, longitudinal along central line. 



Fig. le. Diagram to explain the folding in of squamiform ornament from 

 dorsal to ventral surface. 



Fig. 2. Outline of upper side of carapace of Eurypterus remepis, after Hall, 

 adapted from figs, in Woodward's "Merostomata." 



Fig 2a. Ditto, under side. 



Fig. 3. Carapace of recent scorpion, a little enlarged to compare with figs, 

 1 and lb. 



Fig. 4. Ornamentation of Illcenus, after Salter slightly magnified, for 

 comparison with that found near antero-lateral margins of fig. lb. 



