42 



BRITISH FOSSIL CORALS 



epithecal structures upon the natural classification of simple Corals, I do not think the 

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

 from the Troc/iosmilia. They form [i. e. the type and the variety) a sub-genus of the 

 TrochosmilicB. 



Sub-fam ily — A str^in^ . 

 Division — AsTRiEACE^. 



Genus — Isastu^a. 

 IsASTR^A MoRRisii, Bimcttn. PI. XV, figs. 10 — 12. 



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

 the perfect caHces three cycles of septa in six systems. Usually some of the septa of the 

 third cycle are wanting. 



Breadth of a calice, rather more than y^th inch. 



Locality. Bargate Stone, Guildford, Surrey ; with Terebratella Fittoni, Meyer. In 

 the Collection of C. J. A. Meyer, Esq., F.G.S. 



This small Isastraa is usually found as a cast, and the restored drawing is taken from 

 an impression. The central circular stmcture is due to fossilization. 



The species is closely allied to Isastraa Guettardana,'EA. and H., of the Lower Chalk 

 of Uchaux. 



Family— ¥^:l^Gl'DM. 



Sub-fam ily — Lop h os e ri NiE . 



Genns — Turbinoserts. 



Genus nov. — Turbtnoseris. 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. 



