PART II. CHAPTER XVII. 



215 



Corals of Oolite. 



Columnaria ohlonga, Blainv. CaryophijlUa annularis, Parkin. 



Upper Oolite, Tisbury. Coral rag, Steeple Ashton. 



north of Wilts, and again recur in Yorkshire, near Scarborough. 

 Although the name of coral rag has been thus appropriated, 

 there are portions of the lower oolite, as for example the Great 

 and Inferior Oolite (/. g. Table, p. 213.), which are equally en- 

 titled in many places to be called coralline limestones. Thus 

 the Great Oolite near Bath contains various corals, among which 

 the Eunomia radiata (Fig. -201.) is very conspicuous, single 



Fig. 201. 



Eunomia radiata, Laniouroux. 



a. section transverse to the tubes. 



6. vertical section, showing the radiation of the tubes. 



c. portion of interior of tubes magnified, showing striated surface. 



individuals forming masses several feet in diameter ; and having 

 probably required, like the large existing brain-coral {Meandrina) 

 of the tropics, many centuries before their growth was completed. 



Different species of Crinoideans, or stone-lilies, are also com- 

 mon in the same rocks with corals ; and, like them, must have 



