50 



BRITISH FOSSIL CORALS 



k AsTROccENiA REFTA^s, JDuncau. Plate IV, figs. 4, 5, 6, 15. 



The coralliim is short, convex, and very irregular; it is moderately large for an 

 Astrocoenian, and is covered with numerous and closely packed calices. 



The calices are polygonal and shallow, and are separated by very distinct, plain, 

 cnnienchyma, which is obtusely ridged, and prominent here and there. 



The septa are twenty in number ; ten reaching the columella, and ten joining five of 

 the longer, in pairs. 



The septal arrangement is very marked. 



The columella is small and the costae are rudimentary. 



The length of three calices, with the coenenchyma, is about Igths inch. 



Locality. The Sutton Stone, Brocastle, and at Ewenny. In the Collection of 

 Charles Moore, Esq., F.G.S., Bath. 



0. AsTROCCEjJiA PAiiASiTiCA, Duncan. Plate V, figs. 5, 6. 



The corallum encrusts other Madreporaria, such as dendroid Astraeacese or "remanie " 

 Lithostrotions ; it is small and short, and possesses much coenenchyma. 

 The calices are very small, distant, and shallow. 

 The septa appear to be ten in number. 

 The columella is well marked. 

 The coenenchyma is plain. 

 The diameter of the cahces is about -th inch. 



Locality. The Sutton Stone. In the Museum of Practical Geology, London, 

 ft 



(). AsTROccENiA PEDUNcuLATA, Buiican. Plate V, figs. 7, 8, 9. 



The corallum is small, pedunculate, and fungiform ; it has an epitheca and much 

 coenenchyma. 



The peduncle is short, small, and rounded, and joins the expanded discoid epithecate 

 base of the true coralhun near its centre. 



The discoid base has an epitheca, and its edges are slightly rounded. 



The convex upper part of the corallum is covered with unequal, shallow, and distant 

 calices. 



The calices are irregular in size, and arc small. 



The septa are small, alternately long and short, and are granulated laterally. There 

 arc twenty of them, and the smallest are rudimentary. 



