side view, from the abactinal side, near the ambitus, from the right posterior 



interambulacrum. 

 profile, from the abactinal side, near the ambitus, from the right posterior 



interambulacrum. 

 lower side, midway between the ambitus and the abactinal side, from the 



right posterior interambulacrum. 

 profile, midway between the ambitus and the abactinal side, from the right 



posterior interambulacrum. 

 top view, midway between the ambitus and the abactinal side, from the right 



posterior interambulacrum. 

 lower surface, from the genital plates, 

 profile, from the genital plates. 

 top view, from the genital plates. 



32. Spine, side view, from the madreporic plate. 



33. Spine, from the abactinal side of the right posterior interambulacrum. These spines 



are hidden under the big primary radioles (see PI. 11, fig. 1). 

 The enlargement of the figures is about the same. The shaded figs. 1, 2, and 33 are 

 drawn on a larger scale. 

 Hawaiian Ids., A. Garrett Coll. 



