§ 35. 



CORALS OF THE PALAEOZOIC FORMATIONS. 



641 



This wide geographical range of the same types of coral- 

 line zoophytes, seems to indicate a more equal temperature 



Lign. 141. — Fossil corals. 



Fig. 1, 3. Cyathophyllum turbinatum; Wenlock limestone, Dudley. 



— 2. Fungia lenticulata; Dudley. 



— 4. Surface of Astraea ananas ; Devonshire. 



— 5. Syringopora geniculata ; Mountain limestone ; Mendip Hills. 



— 6. Caryophyllia annularis ; Coral-rag; Wilts. 



— 7. Millepora; Coral-rag; Faringdon. 



— 8. Lithostrotion striatum ; Mountain limestone ; Yorkshire. 



— 9. Surface of Astraea Tisburien sis; Portland Oolite ; Wilts. 

 — 10. Coralline Marble ; Devonshire. 



in the seas of those remote epochs than at present prevails ; 

 for the reef-forming genera do not now exist in waters of 



