CONTENTS. 



Page. 



Introduction 1 



Foraminifera 2 



Sponges 3 



Madreporarian corals 6 



Alcyonarian corals 9 



Hydroids 14 



Annelids 15 



Echinoderms 17 



1 . Crinoids 17 



2. Sea urchins 22 



3. Starfishes 25 



4. Ophiurans 29 



5. Holothurians 32 



6. Summary 33 



Bryozoa 34 



Brachiopods 36 



Mollusks 38 



1. Pelecypods 38 



2. Scaphopods and amphineurans 39 



3. Gastropods 39 



4. Cephalopods 41 



Crustaceans. . . 42 



Calcareous algre 48 



General discussion 55 



II 



