List of Illustrations in the Text. 



Map of Cross Fell drainage area . . 



JEtheia gaulteri and Waldheimia sinuata 



Beak of Hemithyris nigricans and H. psittacea 



Diagrams of Asterias and Edrioaster 



Sketch-map of Northern Italy 



Moraine walls, Lake Garda .... 



Fore-paddle of Geosaurus gracilis . 



Left fore-paddle of Metriorhynchus 



Thecidellina hedleyi, Thomson 



Illustrations of origin of free cheeks of Trilobites 



Types of three Lower Cambrian Trilobites 



Types of Opisthoparian head-shields 



Table showing main lines of modifications amongst Trilobites 



Four sections in Carrara Mountains .... 



Section I. Monte Sagro. 



Section II. Miseglia, Betogli, etc. 



Section III. Monte Corchia. 



Section IV. Monte Bonchi. 

 Map of Marble District, Apuan Alps .... 

 The Carrara Marble Quarries, Mcnte Sagro 



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