FAMILIES AKD GENERA Or THE MADREPOEAMA. 187 



Genus Protar^ea, Ed. & H. 



Genus Alveopora, Quoy et Gaimard. 



Subgenus Favositipora, S. Kent. 

 Genus Somphophora, Lindstrom. 

 Genus Dichor^ea, T. Woods. 

 Genera absorbed : — Stylar^a, Ed. & H., non Seebach ; Me- 



ANDRARiEA, Etallou. 



Favositipora, S. Kent, becomes a subgenus ; Koninckia, 

 Ed. & H., a doubtful genus. 



Genera removed : — Microsolena, Lamour. ; Coscinar^a, Ed. 

 & H. ; DiCTYOPHYLLiA, Blainvillc; Pleurodictyum, Gold- 

 fuss; HoLAR^A, Ed. & H. ; Ccenostroma, Winchell. 



Grenus Porites, Milne-Edwards Sf Jules Saime, Hist. Nat. des 

 Corall. vol. iii. p. 173, altered. 



Colony ramifyirig, or in tufts, or foliaceous, often massive, and 

 lobed or low, incrusting or not. A basal epitheca invariable in 

 the last instance, frequent in all. Corallites with, trabeculate and 

 perforate walls, not distinct from those o£ their neiglibours, and 

 therefore without intermediate coenenchyma. Calices small, 

 pentagonal. Septa twelve or less, feebly developed, trabecular or 

 spinulose. A small columella, forming at its free end a knob or 

 a trabecular point or a style. Pali five or six, and not very distinct 

 from the septal ends, in a circle around the columella. Eudotheca 

 exists sparingly, and may be dissepimental or tabulate, or may be 

 mere stereoplasm. 



Distribution. — Fossil. Eocene : Europe, Sind, Asia. Mio- 

 cene : West Indies and Europe, Sind, Asia. — Hecent. Eed Sea, 

 Indian Ocean, Pacific, "West Indies. 



This genus absorbs Sfi/larcea, Ed. & H., 1851. 



The absence of any intercorallite reticular tissue or coeaen- 

 chyma is invariable in the recent forms ; but in the Eocene 

 Forties panicea, Lonsdale, there is a small quantity in some parts 

 of a colony, but not in all (Supp. Brit. Foss. Corals, Pal. Soc. 

 1866, p. 63 ; P. M. Duncan). 



Grenus Stnar^a, Verrill, Bull. Mus. Camp. Zool. Cambridge, 

 Mass. 1864, No. 3, p. 42. 



Corallum irregularly branched or glomerate. Corallites with- 

 out distinct walls. The septa rudimentary. Six prominent and 

 paliform lobes surround the central cavity, which has a small 

 rudimentary tubercular columella. Outside of the pali are other 



