51 



The record of tlie locality of this specimen has been unfortunately lost. 

 All the other species have been recorded from the Indian Ocean. 



In some respects this species approaches C'actogorgia expansa, but it is 

 easily distinguished by the characteristic shape of the colony iind by the 

 architecture of the anthocodial armature. 



The following table gives a summary of the differences in the anthocodial 

 armature for the different species of C'actogorgia : — 



EXPLANATION OF PLATE. 



Fig. 1. Colony enlarged almost twice natural size, 



Fig. 2. Stalk broken across to show the large main canals ( x 6). 



Fig. 3. Polyps enlarged to show anthocodial armature ( x 35). 



Fig. 4. Spicules from the stalk ( x 25). 



Fig. 5. Spicules of the verrucre ( x 25). 



Fig. 6. Spicules of the anthocodise ( x 40). 



Fig. 7. Spicules from the aboral surface of the tentacles ( x So). 



(Issued separately March 10, 1910.) 



