154 REPORT — 1869. 



3. Smilotrochus c/ranulatus, Duncan. 



The coralliim is conico-cylindrical in shape, and has a more or less trun- 

 cated base. The costae are subequal, prominent, very granular, and distinct 

 superiorly. The septa are subequal, thick, and very granular. The septa 

 are in six systems, and there are three cycles. 



Height -fjj inch. lireadth -^^ inch. 



LocaUt)/. Gault, Folkestone. 



In the 'collection of the liev. T. Wiltshire, F.G.S. 



4. Smilotrochus insignis, Duncan. 



The coraUum is trochoid, short, has a wide calice and a conical and 

 rounded base ; the calice is circular in outline, the fossa is deep and small, 

 and the septa are wide, exsert, curved above, and so marked with one row of ■ 

 granules that their free margin appears to be spined. There are three cycles 

 of septa, and the orders are nearly equal as regards size. The costse are 

 large, prominent, broad at their base, and are marked with one row of 

 granules on the free surface. 



Height -^ inch. Breadth of calice y2_ inch. 



LocaUty. Gault, Folkestone. 



In the 'collection of the Eev. T. Wiltshire, F.G.S. 



An analysis of the genus will be found after the description of the species 

 from the Lower Greensand. 



There is a compoimd or aggregate Madreporarian found in the Gault of 

 Folkestone. It has much cndotheca, and resembles worn specimens of the 

 weU-known Holocystis elegmis of the Lower Greensand. The specimens arc 

 not sufficiently well preserved for identification with any genus. 



FamUy FUNGID^. 



Subfamily FuNsiNiE. 



Genus Miceabacia. 

 Mlcrahada Fittoni, Duncan. 



The corallum is nearly hemispherical in shape ; its base is flat and ex- 

 tends beyond the origin of the septa in a sharp and uninverted margin. The 

 breadth of the base exceeds the height of the corallum. The costae are flat, 

 straight, convex externally at the calicular margin, and equal. The septa are 

 unequal, much smaller than the costae. There are four cycles of septa, in six 

 systems ; tlie synapticulaj between the septa are large. 



Height -fjj in. Breadth nearly | inch. 



Localitij. Gault, Folkestone. 



In the 'collection of the Eev. T. Wiltshire, F.G.S. 



The flat base, the flat costas, and the limitation of the septal number to 

 four cycles distinguish this species from Micrahacia coronula* of the Upper 

 Greensand, and from Micrahacia Beaumontiif, Ed. & H.,of the Neocomian. 



List of new Species from the Gault. 



Variety of Caryophyllia Bowerbanki, Ed. Smilotrochus elongatus, Duncan. 



°! H. granulatus, Duncan. 



Five varieties of Trochoeyathus Harveyanus, • insignis, Duncan. 



Ed. H," H. cvlindricus. Duncan. 



Trochoeyathus Wiltshiri, Du7ican. Micrabacia Fittoni, Duncan. 

 Leptocyathus gracilis, Duncan. 



* Hist. Nat. des Coral, vol. iii. p. 30. t Ibid. p. 30. 



