37. Spine, lower surface^ 



38. Spine, upper surface I- from the ocular and genital plates. 



39. Spine, profile J 



40. Spine, lower surface ") 

 ., £, . . c from the ocular and genital plates. 



41. Spine, upper surface > or 



42. Spine, side view 1 

 .„ _, . . . f from the ocular and genital plates. 



43. Spine, top view } or 



44. Spine, lower surface ) , , , •> - , , 



>- from the ocular and genital plates. 



45. Spine, top view ) 



46. SpiuB) 



47. Spine, 



48. Spine, ^ 

 The figures are about equally magnified except 2, 3, 5, 8, and 46, which are enlargements 



of adjoining figures in outline. The largest radicles at the ambitus measure 15-18 mm. 

 in length. 

 Outer reef, Fakarava, Paumotus, "Albatross" Ex., 1899-1900. 



. spines, hidden by the big radicles, as seen in fig. 1. 



