556 R, F. TOMES ON" MADEEPOEABIA EEOM THE COEAL EAG. 



calling attention to some hitherto unrecorded genera and species. 

 One or two of the Coral-Rag species, fully recognized, but not, as I 

 think, well understood, will also be mentioned ; and finally some 

 remarks will be offered on the well-known Jsastrcea oblonga of the 

 Portland Oolite. 



A large proportion of the Corals from the Inferior Oolite, and a 

 still greater number of those from the Great Oolite, admit of no 

 internal examination, being little better than crystalline casts. 

 The latter, however, often have their external details beautifully 

 retained ; while those from the Coral Eag, on the contrary, very 

 rarely exhibit satisfactory external characters, though their internal 

 structure is well preserved and may be successfully studied by 

 means of polished sections or weathered fractures. 



The genera now added to the Coral - Eag Madreporaria of England 

 are Astrocoenia, Dimorjrfiarcea, and Latimceandrarcea, which are 

 already known, and Crateroseris, which I now introduce as a new 

 genus. 



Highivortli Section. 



ft. in. 



1. Coral Kag, a true Eag, and exposed Rhabdophyllia Phillipsi, Is- 



on the line of dip from Highworth astrcea explanata ?, Astrocoenia 



along the road to Shriyenham, major, Thamn astrcea concinna, 



about 6 Latimceandrarcea corallina. 



2. Bubbly limestone of a yellowish or Ihecosmilia annularis abun- 



ferruginous colour . . ., 1 6 dant. 



3. Fine laminated yellow sand with 



oolitic grains, mostly in layers, and 

 sometimes indurated 5 



4. Fine-grained sand, sometimes pass- 



ing into dark clay, used for brick- 

 makmg 6 



5. Coarse oolitic stone in thin layers.... 6 6 



6. Ferruginous sandy stone in irre- Thecosmilia annularis abun- 



gular thin layers 8 dant. 



7. Limestone in layers, more or less 



oolitic 3 



8. Very dense stone, with a sandy frac- 



ture... 2 



9. Soft white sand, sometimes contain- 



ing calcareous lumps 6 



The foregoing section is to a certain extent a compiled one, bed 

 No. 1, that is the Coral Eag proper, not being visible in direct 

 connexion with those below, which are exposed in near proximity 

 to the town of Highworth. The Eag is observable at several 

 places on the road from Shrivenham to Highworth, more especially 

 in an extensive but shallow quarry near the road which leads to 

 Warnford Place. In this excavation all the Corals mentioned in 

 this paper as occurring in this district have been found ; but as 

 they were chiefly taken either from the heaps of quarried stone, or 

 from the debris left behind, I can only determine their exact 

 position by their appearance and colour, and observe that the large 

 and massive TlvamnastrcecB and Astrocoenice occur in the middle and 



