PLATE III. 



FIG. 1. A ramose turbiporite from Mendip Hills. The corallite, which is silicious, is 

 imbedded in a dark lime -stone. 



2. Is taken from the twenty-seventh plate of Mr. Ellis's natural history of Zoophytes, 



and serves to shew the material difference which exists between the recent 

 Tubipora Musica and the fossil tubipores, Plate I. Fig, 1. 



3. A fragment of black and white marble, which derives its marking from the tubi- 



porite, Fig. 1. 



4. Chain coral (Tubipora Catenulata) in its matrix ; but sufficiently cleared to shew 



its form and structure. 



5. A view, transversely, of the same tubiporite, imbedded in its matrix. 



6. A transverse section of the same fossil, placed between the eye and the light. 



VOI II. Q Q 



