CONTENTS 



I, Introduction 



II. Sponges or Porifrra . 



1. Commercial Sponges 



IX. Crustaceans 



1. Barnacles 5. Sand Fleas 



2. Crayfishes C. Crabs 



3. Shrimps and Prawns 7. Fiddler Crabs 



4. Hermit Crabs 8. Sea Spiders 



X. Mollusks 



1. Clams, Oysters and Mussels 



2. Marine Mussels 



3. Fresh-Water Mussels 



4. Snails and Slugs 



5. Naked Mollusks or Sea Slugs 



6. Squid, Octopus and Nautilus 



7. Squids or Sea-arrows 



XI. Tunicatks 



page 

 15 



25 



III. Jellyfishes and Hydroids 



IV. Sea Anemones and Corals 



V. Starfishes, Se\ Urchins and Sea Cucumbers . 



VI. Worms 



Vlt. Braciiiopods 



Vr[[. Moss Animals and Corallines .... '^ 



30 

 40 

 49 



r>2 



72 



( t 



113 



ICG 



