PLATE XV. 



CORALS FROM THE LOWER LIAS. 



Fig. 



1. The upper calicular surface oi Montlivaltia radiata, Duncan. (P. 61.) 



2. The under surface. 



3. A side view of the corallum, showing the central depression of the base. 



4. The calice, magnified, showing the quaternary arrangement of the septa. 



5. The base, magnified, showing the pellucid epitheca and the costae. 



6. The corallum oi Moiiflivaltia pafi/Ia, Duncan. (P. 50). 



7. The calice, magnified. 



8. Part of the wall and one of the septa, magnified, showing the direction of the teeth. 



9. A very young Montlivaltia, of an unknown species. The calice magnified (P. 52.) 



10. A cornute variety of Montlivaltia imicronata, Duncan. (P. (!().) 



11. One of its septa, magnified. 



12. A portion of the external surface of the type of Montlivaltia tmu-ruuuta, Duncan, 



showing the dichotomous longitudinal bundles of costse, magnified. 



13. A conical variety of Montlivaltia nmcronata, Duncan. 

 15. A section, magnified, of Montlivaltia Buperti, Duncan. 

 10. A large and unusual shape of Montlivaltia ru^osa, Wright. 



17. A side view of its dentate septa. 



14. A dentate process, magnified, showing the ornamentation. 



18. The corallum of Zf«.s'/r(®f/ latimceandroidea, Duncan. (P. 05.) 



19. Its septa, magnified. 



20. The corallum of hastrcBa Tomesii, Duncan. (P. 46.) 



