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 Wiltshiuei, 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 costae 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 four 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 calice, i^ths inch. 



Local'dij. Gfault, Folkestone. In the Museum of the Royal School of Mines, and 

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



This species is closely allied to Trocliocyathus conuhis, Phillips, sp. The compressed 

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

 species from Trochocyathus conulus. 



Genus — Leptocyathus. 

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



The corallum is small, flat, and circular in outjiu^^- 



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

 costse arc very distinct, and the 'c^^(Mless so. All the costae unite centrally at the base. 

 Many are slightly curved. 



The septa are thick externally, veryt^||^i^ial, 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 colvnnella is very rudimentary. 



The calicular fossa is rather wide and shallow. 



Height, hardly yo^I^ inch. Breadth, -^-oths inch. 



Locality. Gault, Folkestone. In the British Museum. 



This species is very closely allied to Leptocyathus eleyans, Ed. and H., of tlie Loudon 



