Xll CONTENTS. 



CHAPTER XIII. 



General characters and divisions of the Ccelenterata — General dis- 

 tribution of Ccelenterates in time — General characters of the 

 Hydrozoa — Distribution of the Hydrozoa in time — The Hydroid 

 Zoophytes — Corynida — Hydractinia — Parkeria — Mitchrfideania 

 — Solenopora — Thecaphora — Dendrograptus — Dictyonema — 

 Oldhamia — Trachymedusse — The Lucernarians — Acraspedote 

 Jelly-fishes — Eophyton, 190-209 



CHAPTER XIV. 



General characters of the Graptolitoidea — Development — Morphol- 

 ogy of a simple Graptolite — Reproduction of Graptolites — Lead- 

 ing types of structure among the Graptolites — Corynoides — Mon- 

 ograptidae — Leptograptidae — Dichograptidae — Dicranograptidas 

 — Diplograptidae — Lasiograptidae — Retiolitidae— Phyllograptidae 

 — Distribution of the families of Graptolites in time — Zoological 

 relationships of the Graptolites, 210-222 



CHAPTER XV. 



General characters of the Hydrocorallines — Structure of Millepora — 

 Geological distribution of the Milleporoids — General characters 

 of the Stylasteridas — Structure of Allopora — Distribution of the 

 Stylasteridae in time — The Syringosphseridae — General charac- 

 ters of the Stromatoporoids — Structure of the skeleton — Chief 

 types of the Stromatoporoids — Actinostroma — Labechia — Beat- 

 ricea — Stromatopora — Amphiphora and Idiostroma — " Cauno- 

 pora" — Zoological relationships of the Stromatoporoids — Gene- 

 ral distribution of the Stromatoporoids in time — Literature of 

 the Hydrozoa, 223-239 



CHAPTER XVI. 



General characters of the Actinozoa — Structure of the soft parts of a 

 simple Actinozoon — Development of the mesenteries — The 

 nature of the skeleton in the Actinozoa — Spicular skeleton — 

 Sclerobasic corals — The structure of a simple sclerodermic coral- 

 lum — Structure of septa — Development of the corallum — Rela- 

 tions of the polype to the corallum — Composite corals — Chief 

 methods of multiplication in corals — Classification of the Actino- 

 zoa — Distribution of the Actinozoa in space — Distribution of the 

 Actinozoa in time, 240-260 



