34 BRITISH FOSSIL CORALS 



All the forms have four cycles of septa and pali before the first, second, and third 

 orders. 



An ill-developed and monstrous form is shown in PI. XIV, figs. 1 — 5. 



2. Trochocyathus Wiltshirei, Duncan. PI. XIV, figs. 10 — 12. 



The corallum is straight, conical, and either cylindrical above or compressed. Its 

 base presents the trace of a peduncle for attachment. 



The epitheca is scanty and in transverse masses. 



The costse are distinct and subequal. 



The calice is very open and rather deep. 



The septa are unequal, hardly exsert, and broad at the margin of the calice. There 

 are foiu' cycles of septa, and six systems. 



The pali are large, and are placed before all the cycles except the last. 



The columella is rudimentary. 



Height, i^ths inch. Breadth of cahce, i^ths inch. 



Locality. Gault, Folkestone. .In the Museum of the Royal School of Mines, and 

 in the Collection of the Rev. T. Wiltshire, F.G.S. 



This species is closely allied to Trochocyaihus conulus, Phillips, sp. The compressed 

 calice, the rudimentary columella, and the shape of the corallum, distinguish the new 

 species from I'rochocyalhus conulus. 



Genus — Leptocyathus. 

 1. Leptocyathus gracilis, Duncan. PL XIII, figs. 5 — 8. 



The corallum is small, flat, and circular in outline. 



The costa? are very prominent, and join exsert septa. The primary and secondary 

 costse are very distinct, and the others less so. All the costse unite centrally at the base. 

 Many are slightly curved. 



The septa are thick externally, very unequal, thin internally, and the largest are more 

 exsert than the others. There are six systems and four cycles of septa. 



The pali are small and exist before all the septa. 



The columella is very rudimentary. 



The calicular fossa is rather wide and shallow. 



Height, hardly ^oth inch. Breadth, -j^ths inch. 



Locality. Gault, Folkestone. In the British Museum. 



This species is very closely allied to Leptocyathus eleyans, Ed. and H., of the London 



