Vaughan. — Madreporaria. 



PLATE 4. 



Figs. 1, la, 16. Bathyactis marenzelleri, sp. nov. p. 66. Fig. 1, calicular 

 view, X 2 ; fig. la, basal view, X 2 ; fig. 16, side view of a septum, X 4. 



Figs. 2, 2a, 26. Balanophyllia galapagensis, sp. nov., p. 67. Fig. 2, upright 

 view of corallum, X 2; fig. 2a, calicular view, X 3; fig. 26, costae, X 4. 



