( iii ) 



TABLE OF CONTENTS. 



PAGE 



Table of Contents ......... iii 



List of Plates .......... vi 



List of Illustrations in Text ...... . vi 



Preface ........... ix 



Geological Time-scale ...... Opposite p. 1 



Plan and Principles of Arrangement . . . . . 1 



Gallery XL Stratigraphical Series . . . . . i 



Historical Collections 6 



Dynamical Series ...... 12 



Tracks and Markings ...... 14 



Gallery X. PROTOZOA 14 



Class FORAMINIFERA ..... 16 



EozooN 25 



Class Radiolaria ...... 26 



PORIFERA (Sponges) 29 



Class Calcarea 31 



Class Hexactinellida ..... 32 



Class Demospongiae ..... 35 



Class (?) OCTACTINELLIDA .... 38 



Class (?) Heteractinellida .... 39 



COELENTERA 43 



Class ScYPHOzoA ...... 44 



Class Hydrozoa ...... 45 



Class Anthozoa ...... 48 



Gallery VIII. ECHINODERMA 58 



Class Crinoidea ...... 58 



Class Cystidea ...... 63 



Class Blastoidea ...... 66 



Class Edrioasteroidea 67 



Class ASTEROIDEA ...... 68 



Class Ophiuroidea ...... 70 



Class ECHINOIDEA 71 



Class HOLOTHURIOIDEA ..... 76 



Echinoderms as Rock-formers ... 76 



