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BRITISH FOSSIL CRUSTACEA. 



Species 11.— EURYPTERUS OBESUS :— H. Woodward. PL XXX, fig. S. 



Euryptekus obesus, H. Woodward. Quart. Journ. Geol. Soc, 1868, vol. xxiv, p. 293, 



pi. x, fig. 1. 



This little form is remarkable for the great obesity of the thoracic somites, the breadth 

 of the fourth segment being equal to the length of the first eight segments. 



Fig. 52. — Diagram-figure of Eurypterus obesus, H. Woodw. 

 Restored and enlarged from the specimen figured on Plate XXX, fig. 8. 



The carapace is 6 lines in breadth at its posterior border ; the lateral and anterior 

 borders form a semicircle ; the length is 3 lines. 



The integument of the carapace and segments was extremely thin, as shown by the 



