viii List of Illustrations in the Text. 



PAGE 



Diagram showing theoretical shells of contraction, compression, and fissuring 



on the earth's crust by process of cooling ...... 436 



Sketch-map showing course of pipe-line across the ' Permian ' beds between 



Hagley and Frankley .......... 448 



Sketch-map showing .S/;i?-o>-iis-limestoue outcrop in Keele Beds, Warwickshire 453 



Portrait of Professor T. Rupert Jones, F.R.S,, F.G.S. . . . .481 



Body-segments of Eiirypterus hibernicus, Baily 487 



Diagrammatic sketch of country around Aberedw ...... 492 



Sketch-map showing river-distribution in Mid-South "Wales .... 510 



