CONTENTS. 



PAGE 



Preface . . . . . . . . i, ii 



Retrospect ........ iii, iv 



History of Echinology since 1862 .... iv — xii 



Bibliography of ditto ...... xiii — xviii 



Divisions of the Cretaceous Formation in England . . 1 — 14, 343, 344 



Classification of the Echinodermata . . . , . 15 — 20 



Terminology of the Component Elements of the Test of the Echinoidea 21 — 28 



Classification of the Echinoidea, Endocyclica and Exocyclica . 29 — 34 



Description of the Families, Genera and Species op the British Cretaceous 



Echinoidea ....... 35 — 342 



Summary of ditto ...... 345 — 359 



Range in Geological Time of ditto ..... 360 



Index ........ 361—371 



