CONTENTS. Xlll 



General characters of the Corynida Hydractinia Labechia 

 Palaeocoryne Corynoides General characters of the Theca- 

 phot-a Dendrograptus Dictyonema Structure and probable 

 affinities of Oldhamia General characters and distribution of 

 the Graptolitidse Structure of a simple Graptolite Reproduc- 

 tion of Graptolites Monoprionidian and Diprionidian forms 

 Characters of the genus Graptolites Didymograptus Tetra- 

 graptus Dichograptus Rastrites Diplograptus Climaco- 

 graptus Dicranograptus Phyllograptus Hydrocorallinse 

 Millepora Stylaster Literature of Hydrozoa, . . . 152-175 



CHAPTER X. 



General facts as to the distribution of the Actinozoa in time Divi- 

 sions of the Zoantharia Characters of Z. malacodermata 

 Characters of Z. sclerobasica, and their distribution in time 

 Nature of a Scleroderinic coral Structure of a simple coral 

 Gemmation and fission amongst corals Deep-sea corals and 

 reef-builders Ancient coral-reefs Divisions and distribution 

 in time of the Zoantharia sclerodermata Aporosa Perforata 

 Tabulata Tubulosa, 176-205 



CHAPTER XI. 



Characters of the Rugosa Recent Rugose corals Operculate corals 

 Families and distribution in time of the Rugosa Characters 

 of the Alcyonaria Tubiporidee Gorgonidse Helioporidae 

 Literature of Actinozoa, 206-223 



CHAPTER XII. 



Characters of the Annuloida Characters of the Echinodermata 

 Distribution of Echinodermata in time General characters of 

 the Echinoidea Structure of the test in Echinoids Spines 

 and tubercles Apical disc Regular and irregular Echinoids 

 Perischoechinidae Distribution of Echinoids in time Chief 

 families of Echinoidea, their characters and distribution, . 224-243 



CHAPTER XIII. 



Characters of the Asteroidea Features distinguishing them from 

 the Echinoidea General structure of a Star-fish The internal 

 and integumentary skeletons Distribution of the Asteroidea 

 in time Families and chief fossil types of the Asteroidea 



