114 



PEOF. P. MARTIN DTJNCAIS-'S EEVISION" OF THE 



gonal and united. Eive principal septa. No columella. Calices 

 from 1 to 2 millim. broad. 



Distribution. — Fossil. Cretaceous (Neocomian) : Europe. 



G-enus Acanthoc(E]S"IA, d'Orligny, Mev. et Mag. deZool. 

 p. 175 (1850). 



Colony massive. Calices circular, with free margins and a 

 styliform columella. Septa in three cycles, but there are only 

 five primaries. 



Distribution. — Fossil. Cretaceous (Neocomian) : Europe. 



VII. Alliance ELASMOCCENIOIDA. 

 Agglomerate Astrseidse, increasing by gemmation between the calices. 

 Corallites united by a second wall, with or without exotbecal coenen- 

 chyraa. 



Genus Diploccenia, E. de From. 

 Genus Diplocceniastr^a, D'Achiardi. 

 Genus Diplothecastr^a, Duncan. 

 Genus Koiloccenia, Duncan. 

 Genus Anisocgenia, Reuss. 

 Genus Heteroccenia, Ed. & H. 

 Genus Elasmoc(enia, Ed. & H. 



Genus Diploccei^ia, F. de Fromentel, Notes a V etude des Folyp. 

 foss. p. 183 (1858-61) ; Descrip. des Folyp. foss. de Vetage 

 Mocom. p. 39, pi. v. figs. 7, 8, 9 (1857). 



Colony tall, or in a rounded mass. Corallites with two walls — 

 one projecting and hidden by the septa, but indicated by a circular 

 bourrelet ; the other united to the walls of the neighbouring 

 corallites separating the costse, and variable in its outline. Co- 

 lumella styliform and strong. Septa entire, thick, and continuous 

 with the costse. Gremmation ? 



Distribution. — Fossil. Oolite and Neocomian : Europe. 



Genus DiPLOCCENiASTRiEA, D'AcTiiardiy CoralU Giurassici delV 

 Italia Settent. (Pisa, 1880). 



Colony in thick laminse. Corallites immersed in the coenen- 

 chyma, which is compact. Calices circular, filling up below. 

 Columella small, spongy. Septa spinulose, straight, the larger 

 joiniDg the columella, continuous with costse which occupy the 

 outer calicular spaces, and merge into those of neighbouring 

 calices. Gemmation peripheral. 



Distribution. — Fossil. European Oolite. 



