DESCEIPTION OF PLATE XXX. 



Ehizophtllum austbale, Etheridge,fil. 



Vi^. 1. The eorallum, dorsal view, x 2. 

 ,,2. „ ventral view, x 2. 



,,3. „ lateral view, x 2. 



,, 4. Eemaius of an operculum, seen from above, x 2. 

 ,, 5. The eorallum lateral view, displaying the vesicular tissue, x 2. 

 „ G. Section of the apex, showing the septa, cardinal septum and 

 vesicular tissue, x 3. 



Ehizophtllum interpunctatum, De Koninch. 



Fig. 7. The eorallum, dorsal view, with the epitheca removed, displaying 

 the infundibuliform layers of vesicular tissue, x 2. 

 „ 8. „ ventral view, x 2. 



,,9. „ lateral view, x 2. 



,, 10. The calice, filled with vesicular tissiie, x 2. 

 ,, 11. Another calice, with the counter sejitum and woi'n septa exposed 



on the ventral wall, x 2. 

 ,, 12. The eorallum, ventral view, showing the position of the counter 



septum, and transverse bands of growth, x 2. 

 ,, 13. A similar view, x 2. 

 ,, 14. Internal cast of the calice, ventral side, with the granulated entire 



septa, x 2. 

 „ 15. The same seen from below, showing both the dorsal and ventra 



septa. 



Pal^aster meridionalis, Eth. fil. 



„ IG. Impression of the actinial surface, x 2. 

 „ 17. Mould taken from specimen, X 2. 



