FROM THE ZONE OF AMMONITES AXGULATUS. 



17 



Height of corallum T^tlis incli ; breadth of caUce /^ths inch. 



Locality. Brocastle. In the Collection of Charles Moore, Esq., F.G.S., Bath. 



12. Thecosmilia plana, Duncan. Plate III, figs. 24, 25. 



The corallum is short, the calices separate rapidly, and soon attain a considerable size. 

 The epitheca is strong, and constricted here and there. 



The caHces are large, shallow, oval, and are deeper at the centre than elsewhere • 

 their margin is indistinct, and the septa are rounded, faintly dentate, distant, and'^very 

 irregular. There are about thirty septa. 



Height of corallum ^^ths inch ; breadth of calice /oths inch. 



Locality. Brocastle. In the Collection of Charles Moore, Esq., F.G.S., Bath. 



These species of the genus Thecosmilia may be arranged for the purposes of 

 diagnosis as — 



Long and more or less bush-shaped 

 Pedunculate and capitate 



Short and stunted 



Taken as a series, the species are very characteristic of the Coral-fauna of the 

 period. 



( Th. Martini. 

 I Th. Michelini. 



( Th. Suttonensis. 

 \ Th. mirubilis. 

 I Th. T'erquemi. 

 V. Th. seria/is. 

 ^ Th. irregularis. 

 Th. ruffosa. 

 Th. plana. 

 j Th. Brodiei. 

 I Th. dentata. 

 \Tk. affinis. 



Genus — Rhabdophyllia. 

 1. Rhabdophyllia recondita, Lauhe} Plate II, figs. 7 — 9. 



The corallum is pedunculated, has very fine costal markings, which are flat, and 

 a delicate epitheca. 



The corallites separate rapidly at the extremity of the peduncle. 



The calice (section of) is almost circular, and is crowded with rather stout septa. 



The septa are unequal, longer at the calicular margin than elsewhere, and either 

 reach the columella or enlarge at their free extremity at different distances from it. 



1 Laube, 'Die Fauna der Schichten von St. Cassian,' 1 Abtheil. 



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