xviii ILLUSTRATIONS 



FIG. 



38. Adult Colony of Poritcs in which tlie Upper Zooids are 



killed by Sediment 108 



39. A Snvd.]\ Colony of Agai icia 109 



40. Type of Repair of Madrepora when the " Dominant Apical 



Zooid " is not destroyed 113 



41. Type of Repair of Madrepora when the "Dominant Apical 



Zooid" is entirely destroyed 113 

 4 2. Moniipora Colony repairing a Branching Growth by an 



Encrusting Layer H" 



43. Colony partly killed by Deposition of Sediment 1 19 



44. Colony showing Death by Sediment overtaking it from 



below 126 



45. Specimen showing the Tunnelling of a Living Coral Colony 



by Boring Parasites 127 



46. The " Stings " caused by Contact with a Colony of Millepora 



alcicomis 132 



47. The Lagoonlet of Pulu Luar at High Tide 140 



48. Chart of Keeling Atollon 142 



49. Section of the Island and Barrier according to Darwin 152 



50. Transverse Section of the Submarine Ridge and the Cocos- 



. Keeling Atoll 152 



51. Section of the Atoll and Submarine Slopes according to Dr. 



H. B. Guppy 152 



52. Theoretical Section to show : i. The Breccia Platform (black) ; 



ii. The Island Pile of Coral Fragments and Sand 153 



53. Theoretical Section of Funafuti Atoll 153 

 64. Living Specimen of an Alcyonai-ian Coral I61 



55. The Ikan Kakatna Jjou {Scarus) l65 



56. Holothurians feeding at the Bottom of a Ban-ier Pool I66 



57. Western End of Pulu Tikus 174 



58. Diagram to Show the Prevalent Winds of the Atoll 203 



59. Illustration used by Darwin to make clear the Stages of 



'^ Subsidence " in Atoll Formation 219 



