96 OUR COMMON BRITISH FOSSILS. 



silica has retained the impression, if not the structure, 

 of the coral flesh. Many of the Norwich fossil corals 

 have the exteriors coated over with fossil Polyozoa. 

 The best pits for these fossils about Norwich are 

 Household Hill, Thorpe, Postwick, Trowse, and 

 Eaton ; but everywhere in the chalk there is an 

 absence of reef-building species of corals. 



The Tertiary rocks of this county are rather poor 

 in corals. We have no positive evidence of coral-reefs, 

 unless the slight appearances seen at Brackleham 

 warrant us in thinking some traces are found there. 

 The railway cutting yields several species, chief among 

 which are three belonging to the genus Solenastrcea. 

 A large fossil Madrepore favours the reef idea. Other 

 corals met with are Oculina, Solenastr&a, Styloccenia, 

 AstroccBnia, Trochocyathus, Dendrophyllia t Litharcea 

 Websteri. The latter is very common. Other localities 

 are Brook (in the New Forest), Bramsham, and High 

 Cliff (in the Isle of Wight). At Haverstock Hill we 

 get Leptocyathus t Turbinolia, etc., from the London 

 Clay ; in the Isle of Sheppey, Paracyathus is a not 

 uncommon fossil coral. 



We now "take a leap" to the Pliocene beds of 

 Suffolk, where, in the Coralline Crag of Orford, Ged- 

 grave, Sudbourne, and Ramsholt (close to the tidal 

 river Deben), we get Cryptangia Woodi, a fine 

 branching coral ; Flabellum Woodi, a pretty, wedge- 

 shaped, single coral, about an inch in length ; Spheno- 

 trochus, etc. The latter is a small single coral, related 



