CONTENTS 



Page 



Abstract 1 



Introduction 2 



Location and methods 2 



Echinoid fauna 5 



Acknowledgments 5 



Echinoid distribution 8 



Major environments 8 



Systematic discussion of species 12 



Eucidaris tribuloidcs (Lamarck) 12 



Diadema ant ilia rum Philippi 14 



Astropyga magnified Clark 15 



Arbacia punctulata (Lamarck) 17 



Echinometra lucunter (Linnaeus) 18 



Echinometra viridis Agassiz 20 



Lytechinus variegatus (Lamarck) 21 



Tripneastes ventricosus (Lamarck) 24 



Echinoneas cyclostomus Leske 25 



Clypeaster rosaceus (Linnaeus) 26 



Clypeaster subdepressus (Gray) 28 



Leodia se.viesperjorata (Leske) 31 



Encope michelini Agassiz 33 



Plagiobrissus grandis (Gmelin) 36 



Brissus unicolor (Leske) 38 



Meoma ventricosa (Lamarck) 38 



Schizaster (Paraster) floridiensis Kier and Grant, new species. ... 50 



Enemies of echinoids 54 



Relation of test shape to living habit 55 



Abnormal specimens 56 



Conclusions 58 



Literature cited 61 



Explanation of plates 63 



