20 BRITISH FOSSIL CORALS 



The columella is distinct and formed by one pimple-shaped mass. 



The septa are in very unequal systems, and there are three incomplete cycles. They 

 are short, rather moniliform, perforated on their free margins, marked with lateral synap- 

 ticulas, and end in larger or shorter costse, which are continuous with the septa of 

 neighbouring calices. 



The endotheca is fully developed, and is partly in the formof synapticulseand partly of 

 dome-shaped dissepiments. 



Height of corallum x%ths inch. 



Breadth of calicular surface 2| inches. 



Breadth of calices troths inch. 



Locality East Coker. Inferior Oolite. 



In the Collection of W. Mansel, Esq., F.G.S. 



3. ThamnastRjEA Manseli, Duncan. PI. IV, figs. 11 — 14. 



The corallum is small and conical, with a rounded apex, which is inferior, and a 

 circular flat but slightly gibbous upper or calicular surface. 



The epitheca is distinct and is marked with transverse lines, and where abraded 

 permits the costse to be seen. 



The costse are numerous, alternately large and small, slightly apart, and are connected 

 by numerous synapticulse. 



The calices are numerous, small, nearly circular, shallow, and are separated by distinct 

 nodular elevations of coenenchyma. 



The septa are distinct, rather monihform, unequal, and more or less continuous with 

 those of the neighbouring calices. They are broader externally than within the calice, and 

 the larger unite more or less to form a false columella. 



The costge on the calicular surface are wavy and moniliform. 



There are six systems of septa and usually some orders of the fourth cycle in addition 

 to the complete but very irregularly disposed third cycle. 



The endotheca is abundant and assumes the synapticular form. 



Height of corallum iijths inch. 



Breadth of calicular surfaces l^ths inch. 



Breadth of calices about xoth inch. 



Locality. East Coker. Inferior Oohte. 



In the Collection of W. Mansel, Esq., F.G.S. ^ 



