130 



PEor. p. MARTIN Duncan's eevision op the 



Genns Holocystis, Lonsdale, Quart. Journ. Geol. Soc. t. v. p. 83 

 (1849) ; Milne-Edwards Sf Jules Haime, Brit. Foss. Corals, 

 p. 70, pi. X. fig. 5 (1850). 

 Syn. Tetracoenia, d'Orb. 



Colony in a convex mass, increasing by extra-calicular gemma- 

 tion. Corallites united directly by tbeir walls or by costse, which 

 are thick and usually well developed. Calices subpolygonal, 

 either united by their margins or separated by a broad groove ; 

 fossula deep. Columella very small, styliform. Septa entire, in 

 three complete cycles ; four primaries much more developed than 

 any other septa, exsert, close, thick at the margin and beyond, 

 feebly granular, and very unequal according to their orders. 

 Dissepiments of one kind, simple, horizontal, equidistant, and 

 corresponding in height in the different interseptal loculi, formiug 

 tabulae, which are traversed by the primaries. 



Distribution. — Fossil. Lower Cretaceous : England . Aptien : 

 Europe. 



Glenus CoccoPHYLLrM, Beuss, " Anthozoen der KbssenerscTiicliten 

 und der alj^inen Trias^^ Sitzungsh.der Kais. AJcad. der Wiss. 

 Wien, 1865, p. 167. 



Colony broad, convex. Corallites united by their irregular- 

 shaped walls. Calices of various sizes, polygonal. Columella 

 absent. Septa projecting but little into the calice, distinctly 

 granular at their free edge. Tabulae abundant, stretching across 

 the interior of the cylindrical corallite, and often with a concave 

 upper surface. Gemmation from the calicular wall. 



Distribution . — Fossil. Trias: Europe. 



The next genus stands much alone. The young calices sur- 

 round the larger parent, and arise by marginal budding. The 

 walls are thin, and almost rudimentary where the buds join. The 

 endotheca is very abundant, coming high up, and centrally there 

 are tabulae. A rudimentary columella exists. 



It must form a group with affinities with the Eugosa, like the 

 Alliance just noticed. 



Group-genus Moseleya, Quelch. 

 Genus Moseleya, Quelch, Ann. Sf Mag. Nat. Rist. 1884, 

 vol. xiii. p. 292. 



Corallum compound (colony), flattened, or slightly and broadly 

 convex. Young calicles developing by calicinal marginal budding 



