IV Contents. 



PAGE. 



II. The Fauna Associated with the Crinoids of a Tropical Coral Reef: 

 with especial reference to its Colour Variations. By F. 



A. POTTS. 1 plate, 7 text-figures 71-96 



Introduction 73 



Decapoda Macrura 75 



Alpheidse 75 



Relations of Commensal and Host 77 



Pontoniidse 



Decapoda Anomura 



Galatheidse 



Amphipoda 87 



Cydotelson gen. n 87 



Isopoda 



Echinoderms 91 



Polychseta 91 



The Colouration of the Myzostomids and its relation to that of 



their Hosts 93 



Gasteropoda 95 



Summary 96 



IV. The Comatulids of Torres Strait: With special reference to their 



Habits and Reactions. By HUBERT LYMAN CLARK .... 97-125 



Introduction 99 



Part I. The Comatulids of Torres Strait 101 



Part II. Habits and Reactions 107 



Material 107 



Methods 108 



Locomotion 109 



Food and Feeding 114 



Response to Light 115 



Response to Heat 116 



Response to other Stimuli 118 



Summary 120 



Conclusions 



V. The Pluteus of Laganum sp. By GRACE MEDES. 22 text-figures . 127-142 



Internal Structure 130 



Internal Anatomy 131 



The Larval Skeleton 131 



The Permanent Skeleton 132 



Plates 132 



Spines 132 



The Amniotic Cavity 134 



The Enterocceles 135 



Discussion 140 



Rate of Growth 140 



Formation of the Amniotic Cavity 140 



The Enterocoeles 141 



Bilateral Symmetry 142 



Bibliography 142 



