136 



EXPLANATION OF THE PLATES. 



Ti<r. 9. Terminal knob of arm seen from above. 

 Fi''. 10. A terminal knob, seen from the actinal side. 

 Fi''. II. The same, seen from the end. 

 Fig. 1 2. Madrcporic body. 



All Figures natural size, with the exception of Figs. 9-12, which are somewhat enlarged. 

 The colorin. of^this species is quite dull ; it has a ^ayish hue, with lar.e square patches of brown arranged along the 

 margL of the arrns. The color of the abactinal surface is frequently iu lines, one in central part of the arms, the others 

 along their margin. The ambulacral tentacles are yellow. 



