

PLATE XXIII. 



DEVONIAN CRUSTACEA. 



Order — Merostom ata . 



Sub-Order — Eurypteriua. 



Stylonurus Scoticus, H. Woodw. A nearly entire specimen, having its dorsal surface 

 exposed on a slab of sandstone, and the last five body-segments detached entire, 

 so as to exhibit both the ventral and dorsal surfaces ; reduced to three eighths its 

 natural size, the original specimen measuring three feet four inches in length. 

 (P. 126.) 



Lower Devonian, Forfarshire. 



From the Collection of James Powrie, Esq., F.G.S., Reswallie, near Forfar. 



