46 PEOF. p. MAETIN DITNCAn's REVISION OE THE 



and strongly echinulate or cellular, often with an intercalicular 

 ridge. Costse absent. Internal cavities filling up more or less. 



Distribution. — Recent. Madeira, Morida, Caribbean sea. Brazils, 

 Isle de Bourbon, Indian Ocean, (Adriatic ?) . 



This genus absorbs Axohelia, Milne-Edwards & Jules Haime, 

 1849, wliicb was placed by those authors in the Stylasteracese (Hist. 

 Nat. des Corall. vol. ii. p. 126) ; and as tbe other Stylasteracese 

 have been shown by Moseley to be Hydrocorallinse, tbe sub- 

 family disappears entirely from the Zoantharia Sclerodermata. 



Milne-Edwards and Jules Haime introduced their genus 

 Areacis into the group which associated Stylophora and Mad- 

 racis ; but its species must be relegated to the Astrseidse with a 

 cellular coenenchyma and Hi-developed visceral tabulae. 



In this arrangement of the Oculinidse the following genera are 

 absorbed or are not considered, in consequence of unsatisfactory 

 definition or evident synonymy : — 



DiPLOHELiA, Ed. & H. Placohelia, E. de From. 



Stylangia, E. de From. Phyllohelia, E. de From. 



PsAMMOHELiA, E. de From. Platyhelia, T. Woods. 



Axohelia, Ed. & H. Pentalophora, Kent. 



Phyllopora, T. Woods. Reussia, Duch. et Mich. 

 Tiaradendron, Quenst. 



The genus Aagtlielia, Eeuss, becomes a subgenus of Oculina. 

 The genus Areacis, Ed. & H., is removed to the Astrseidse. 



III. Family POGILLOPOEID^. 



Colonial Aporose Madreporaria witb tabulse, septa small and 

 rudimentary. Columella well or ill developed. Corallites filling 

 up with steroplasma. Intercorallite structure coenenchymal and 

 solid. Animal witb disk, tentacles, and a single pair of long 

 mesenterial filaments. 



Verrill stated, in his ' Notes on Eadiata,' p. 523, that Pocil- 

 lopora, although a tabulate coral, must enter the section in 

 which he placed the Oculinidse. He satisfied himself of the cor- 

 rectness of Mr. Bradley's observations that Pocillopora had twelve 

 tentacles, six being upright and six held horizontally, and that it 

 was not a Hydroid. The arrangement and form of the tentacles 

 resemble those of the Perforate coral Forites, but the tissues are 

 solid. 



