ON THE BRITISH FOSSIL CORALS. 157 



LoectliUj. Bargate Stone, upper division of the Lower Greensand, Guild- 

 ford, Surrey. Found with " AuicuJa pect.inaia,'" Sow. 



In the collection of C. J. Mej^er, Esq., F.G.S. 



The small TrochosmiUce are common in the Bargate Stone, where they 

 were discovered by Mr. Meyer, from whom I have obtained the names of 

 the associated fossils. The presence of epitheca would apparently necessi- 

 tate these fossils being placed in a new genus ; but after a careful examina- 

 tion of the bearings of the absence or presence of the epithecal structures 

 upon the natural classification of simple corals, I do not think the j^oint 

 sufficiently important to bring about the separation of Mr. Meyer's little 

 corals from the TrochosmiUce; they form (;'. e. the type and variety) a 

 subgenus of the TrochosmiUce. 



Subfamily Aste^in^. 



Division Aste^ace^. 



Genus Isastr^a. 

 Isastrcea Morrisi, Duncan. 



The corallum is flat and very short. The corallites are unequal and 

 usually five-sided. There is no columella. The wall is thin. The septa 

 are slender, imequal, and most of them reach far inwards. There are in 

 the perfect calicos three cycles of septa in six systems; usually some of 

 the septa of the third cycle are wanting. 



Breadth of a eahce rather more than j\y inch. 



Locality. Bargate Stone, Guildford, Surrey ; with TerehratelJa Fittoni, 

 Meyer. 



In the collection of C. J. Meyer, Esq., F.G.S. 



This small Isastrcea is usually found as a cast, and the restored drawing 

 is taken from an impression. The central circular structure is due to fos- 

 silization. 



The sjjecics is closely allied to Isastrcea Guettarclana, Ed. & H., of the 

 Lower Chalk of Uchaux. 



Family FUNGID^. 



Subfamily Lophoserin^. 



Genus Turbikoseris, gen. nov. 



The corallum is simple, more or less turbinate or constricted midway 

 between the base and calice ; the base is either broad and adherent, or 

 small and free. 



There is no epitheca, and the costse are distinct. There is no columella, 

 and the septa unite laterally, and are very numerous. 

 Turbinoseris ch-FromenteU, Duncan. 



The corallum is tall, and more or less cylindro-turbinate. The calice is 

 shallow, and circular in outline. The septa are very numerous, long, thin, 

 straight, and many unite laterally with longer ones. There are 120 septa, and 

 the cyclical arrangement is confused. The synapticulse are well developed. 

 There is no columella, and the longest septa reach across the axial space. The 

 costa3 are well developed, and often are not continuous with the septal ends. 



Height Ij^- inch. Breadth of calice 1^^- inch. 



Variety. With a constricted wall and large base. 



Locality. Atherfield, in the Lower Greensand. 



In the collection of the Eoyal School of Mines. 



The necessity for forming a new genus for this species is obvious ; it is 



