PLATE V. 



Fro. 1. A madreporite resembling the fossil madrepore of Helwing, Fought, Volkmann, 

 and others, which has been named Madrepora slnanas. At , is shewn the 

 mode in which, as in proliferous flowers, the newly-formed parts proceed from 

 the centre of each existing disk. At k t is represented the mode of growth in 

 the Madrepora Stellaris. 



2. The madreporite from Gothland, known as Madrepora Truncata. At c, is shewn 



the proliferous mode in which the new joints arise from the surfaces of the al- 

 ready formed stars. 



3. A polished transverse section of the Lithostrotion of Lhwydd, from Wales. 



4. A fossil stellated madrepore, from Lincolnshire. 



5. A madreporite, from Steeple Ashton. 



6. The lithostrotion, or basaltiform madreporite, the transverse section of which is 



shewn, Fig. 3. 



7. The spider-stone, or Arachneolithus, of Bruckman. 



8. A stellated madreporite, from Ribieze, in Transylvania. 



9. A madreporite, bearing somewhat of a honeycomb appearance, from Masbury, 



near Mendip. 



