FAMILIES AK"D aEI^EEA OF THE MADREPOEAEIA. 



41 



G-enus Den"deohelia, Etallon, Letlicea Bruntrutana, 1864, 

 p. 358, pi. 1. fig. 4. 



Colony mammillated or branched, coalescing. Coenencliyma well 

 developed and compact, especially on the parent stem. Calices 

 irregularly placed, sometimes in a subspiral manner, costulate 

 near tlie margin. Stem granular. Columella styliform. Septa 

 unequal, entire, or non-exsert. Gemmation irregular. 



Distribution. — Fossil. Oolite of Europe. 



III. Alliance OCULINOIDA. 



Oculinidse with arborescent or tufted, alternately, oppositely, or dLchoto- 

 mously gemmating colonies. Gemmation rarely from one side only. 

 Septa entire; subentire, or spinulose where free. Pali before one or more 

 sets of septa. Columella various. Fissiparity very rare. 



Genus Oculina, Ed. & H. 



Subgenus Agathelia, Reuss. 



Genus Cyathohelia, Ed. & H. 



Genus Synhelia, Ed. & H. 



Genus Trymohelia, Ed. & H. 



Genus Sclerohelia, Ed. & H. 



Genus Bathelia, H. N. Moseley. 



Genus Haplohelia, Reuss. 



Genus Octjlina, Milne-Edwards Sf Jules Haime, Oomptes Hend. 

 de VAcad. des Sci. t. xxix. p. 68 (1849), amended. 



Colony arborescent or in tufts. Corallites arranged more or 

 less distinctly in ascending spiral series, or scattered irregularly, 

 prominent or sunken, often arising from an incrusting base. 

 Coenencliyma solid and smooth or finely papillose. Calices cir- 

 cular, oval, prominent or depressed. The columella either well 

 developed and papillary at the surface, compact at the base, or 

 rudimentary. The septa are well developed, entire or slightly 

 spinulose where free, some exserfc. Pali exist before all the 

 septa except those of the last cycle. Costse as striations, or 

 decided projections extending a short distance from the calicular 

 margin. In rapidly growing forms there is no coenenchyma 

 independent of the buds. Endotheca may exist. 



There are two sections of the genus. In the first, which con- 

 tains the majority of the recent forms, the growth is by gem- 

 mation ; and in the second, which contains recent and fossil 

 forms, there is also fissiparous division. 



Distrihution. — Fossil. Eocene: Europe, Asia. Miocene: 



