8 



BRITISH POSSIL CORALS 



2. MoNTLivALTiA MuRCHisoNiiE, Buncan. PL VIII, figs. 10, 11, 12. 



The corallum is short and turbinate : the peduncle is small, and the calice is large, 

 deep, and open. 



The epitheca is distinct and swollen out in some places, being slightly constricted 

 in others. 



The calice is circular in outline, very deep, and has a sharp margin. 



The septa are numerous, very distinct, and very remarkable, both in their arrangement 

 and relation to the costae. 



The largest septa are bluntly dentate and exsert ; the rest are faintly dentate, and pass 

 deeply into the fossa, and there are a few rudimentary septa. The rounded costae are 

 continuous internally with the interseptal spaces, and the septa are continuous with inter- 

 costal spaces (fig. 12). 



The cyclical arrangement of the septa is confused. There are forty-eight septa, but 

 these do not appear to form four cycles in six systems, but to be arranged in four systems, 

 there being four septa larger than the others. 



The height of the corallum is ^^ths inch. 



The breadth of the calice is /gths inch. 



Locality. Brocastle. 



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



The arrangement of the septa and the depth of the calice distinguish this species very 

 readily. It has its mimetic Thecosmilia in Tliecosmilia Brodiei, Duncan. 



3. MoNTLiVALTiA TOLYMORPHA, Terqucm et Piette} PI. VII, figs. 14, 15; PI. VIII, 



figs. 1—4 and 13—15. 



The corallum is simple, very variable in form, and has a thick and folded epitheca 

 reaching to the calice, and is marked with fine and regular costse. The corallum is rather 

 narrowly pediculate, or adheres by a portion of its base. In shape the corallum may be 

 conical, oblong, or flattened. 



The calice is more or less deep, is either round or oval, and its margin is thin. The 

 septa are numerous, have strong teeth on the upper margin, and are smooth laterally. 

 There are five complete cycles, and the sixth is incomplete. 



MM. Terqucm et Pictte do not give the measurements of the Coral, but in their plate 

 the height varies from ? inch to 2:5 inches, and the calicinal diameter from ' inch to 

 \\ inch. 



' ' Le Lias Infcrieur de I'Est de la France,' p. 127, pi- xvi, figs. 17 — 21. 



