PLATE VIII. 



FIG. 1. A piece of lime-stone composed of minute round bodies, the nature of which is 

 unknown; but a magnified view of which is given, Fig. 12. 



2. A branch of a fossil coral of the Isis genus, from Sicily. 



3. A ramose milleporite, imbedded in a compact lime-stone, from Wiltshire; a mag- 



nified representation of a part of the surface of which is shewn, Fig. 11. 



4. A joint of the trunk of the fossil Isis, a branch of which is represented, Fig. 2. 



5. The inferior part of a fungiform alcyonite, or spongite, the plicoe of which are 



connected by anastamosings, similar to what takes place in the specimen, 

 Plate XI. Fig. 3. 



6. Part of a ramose madreporite, from Switzerland. 



7. A joint of a fossil Isis, imbedded in it's matrix. 



8. A pebble, from the Hackney gravel-pits, bearing marks of organization in its 



surface. This fossil obtains illustration from the one at Fig. 10. 



9. A ramose madreporite, imbedded in chalk, from France. 



10. A pebble, from the gravel-pits Hackney, on the surface of which are small 



roundish bodies connected by minute fibres. 



11. A magnified representation of the surface of the milleporite, Fig. 3. 



12. A magnified representation of some of the minute bodies forming a great part of 



the mass of the fossil, Fig. 1. 



13. A magnified representation of a section of one of the round bodies, of which the 



following specimen is composed. 



14. A silicious stone, composed of round bodies, the nature of which is at present 



unknown. 



