PLATE XIII. 



Page 

 Fig. 1. Stenella spinosa, u. sp. Natural size. (After this specimen was drawn, 



several much larger and more characteristic specimens 

 were discovered), . . . . .58 



Fig. 2. ,, ,, Two polyps ; enlarged. 



Fig. 3. „ johnsoni, n. sp. Two polyps ; enlarged, . . .57 



