Contents 



Introduction 



Classification 



Asteroidea 



External Structure 



Internal Structure 



Habits 



Food 



Natural Enemies . 



Damage to Oysters and Other Mollusks 



Rate of Growth 



Migration . 



Variation in Number and Arrangement of Rays 



Regeneration 



Reproduction 



Development 



Key to Species 



Asterias forbesi 

 Asterias vulgaris 

 Asterias tenera 

 Henricia sanguinolenta 

 Ophiuroidea 

 Structure . 

 Habits 

 Food 



Reproduction 

 Development 

 Key to Species 



Ophiura brevispina 

 Ophiopholis aculeata 

 Amphipholis squamata 

 Amphioplus abditus 

 Amphioplus macilentus 

 Echinoidea 



Structure . 

 Habits 



Reproduction 

 Development 



PAGE 



II 



13 

 19 



20 



25 

 28 



29 

 32 



33 



40 



43 



43 



45 

 48 



52 



58 



59 

 61 



63 

 65 

 67 

 68 



73 

 75 

 76 



77 



79 



79 

 80 



81 



82 



84 

 85 

 85 

 97 

 100 



100 



