54 BRITISH FOSSIL CORALS. 



VIII. Corals from the Eocene of the Isle of Wight and from the London Clay. 



Okd^^—ZOANTHJRIA. 



Family— TURBINOLIDifl. 



Tribe — TuRBixoLiNiE. 



Genus — Turbinolia. 



1. Turbinolia affinis, Banean. Plate IX, figs. 1, 2, 3. 



The corallum is slightly truncated inferiorly, and it is conical low down, but cylindro- 

 conical above ; it is symmetrical and very small. 



The costae are well developed and obtuse ; the largest are swollen out inferiorly, and all 

 are moderately prominent ; not very thick, but very distinct. 



The intercostal spaces are wide on account of the costae being separated by a portion 

 of the wall, which is very visible at the bottom of the spaces. 



There are no dimpled markings on this portion of the wall. 



There are very decided markings on the sides of the costae produced by rudimentary 

 exotheca. 



The wall is thin. 



The calice is circular in outline. 



The septa are thin, delicate, unequal, rather ragged, granular, and slightly enlarged 

 near the columella. There are three perfect cycles of septa and six systems. 



The numbers of the septa and costae are the same. 



The columella is not very projecting above the base of the calicular fossa, and is rather 

 elongated and ovoid. 



The height of the corallum is ~\X\% inch, and the diameter of the calice nearly ~,th inch. 



This species is more closely allied to the rare Tuvhinolia firma, Edwards and Haime, 

 than to any of the other members of the genus. The broad intei'costal spaces and the 

 markings on the sides of the costae in the new species distinguish it from Turbinolia 

 Jirma. 



Localitij. High Chff, Isle of Wight. In the collection of Frederick Edwards, Esq., 

 F.G.S. 



