FAMILIES AND GENEEA OF THE MADREPOEAEIA. 



45 



Genus Stylophora, Ed. & H. 



Genus Stylohelia, E. de From. 



Genus Madracis, Ed. & H. 

 The genera Psammohelia, E. de From., and Phyllopora, Tennison 

 Woods, are absorbed in StylopJiora; Axohelia, Ed. & H., Pentalo- 

 phora, Kent, Reussia, Duch. et Mich., in Madracis-, Areacis, Ed. & 

 H., is removed to the Astraeidse. 



Genus Sttlophoea, Milne-Edwards Sf Jules Haime, Hist. Nat* 

 des Corall. vol. ii. p. 133 (1857). 



Sjn. Psammohelia, E. de rrom. ; Phyllopora, T. Woods. 



Colony arborescent, or palmate, or incrusting. The calices are 

 rather deep, and present a styliform columella. The septa are 

 unequal, six being well developed and six rudimentary. Coeneu- 

 chyma between the corallites subcompact and granulated, and 

 often ridged. The costae are rudimentary. Dissepimental endo- 

 theca present, and the internal cavity often obliterated. Gem- 

 mation irregular and lateral. 



Distrihutionr — Fossil. Eocene : Europe, West Indies, Sind in 

 Asia. Miocene and Pliocene : Europe. Miocene : Sind in 

 Asia. — Becent. Eed Sea, Indian Ocean, Cape of Good Hope, 

 Chinese seas, Australian seas ? 



Genus Stylohelia, de Fromentel, Introd. a V etude des Polyp. 

 Foss. 1858-60, p. 180. 



Colony massive or dendroid. Calices very projecting as trun- 

 cated cones, strongly costulate near the calices, but granular 

 over the rest of the coenenchyma, which is foliated and more or 

 less dense. Columella strong and styliform. The larger septa 

 unite with the columella by means of horizontal trabeculse 

 regularly placed. Septa in three cycles, the last rudimentary. 



Distribution. — Fossil. Oolite : Europe. 



Genus Madeacis, Milne-Fdwards Sf Jules Uaime, Hist. Nat. 

 des Corall. vol. ii. p. 139 (1857), amended. 



Syn. Axohelia, Ed. & H. 



Colony arborescent or incrusting more or less. Calices small, 

 shallow, with a sharp styliform, sometimes compressed columella, 

 and ten or twelve equal, exsert, subentire septa. Gemmation 

 spiral more or less, or irregular. Coenenchyma nearly compact 



