PLATE XXII. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Tryplasma princeps, Ethfil. (?) 
A large corallite, with strong bourrelets or accretion rings, in which it departs widely 
from this species. 
Tryplasma wellingtonensis, Eth.Jil. 
A turbinate corallite, with a portion of the wall removed, showing the septal lamellae 
grooves and holes left by the septal spines. 
A small calice, displaying the primary septal spines and secondary granules, tabulae, and 
radiciform processes. 
8ome of the septal spines and granules from Fig. 3 enlarged. 
Tryplasma derrengullenensis, Eth.Jil. 
A small turbinate corallite, with bases of radiciform processes. 
A more obconical corallite, showing the remains of the calice with the grooves left by 
the primary and secondary septal lamella?, and the holes by the septal spines of the 
two orders. 
A number of the septal grooves and spine holes highly magnified. 
A more or less distorted corallum, turbinate below, cylindrical above, with bases of 
radiciform processes. 
Tryplasma delicatula, Ethfil. 
Transverse section of two corallites prepared for the microscope.- — x 3. 
Tryplasma princeps, Eth.Jil. 
Transverse section of a radiciform process prepared for the microscope. — x 3. 
Tryplasma dendroidea, Eth.Jil. 
Parent corallite and four buds. 
„ and three buds. 
Polished longitudinal section of part of a corallite, showing regular complete tabula?. 
Transverse section of a corallite, prepared for the microscope, with sharp acicular septa 
spines, and wide central tabulate area.--x 2. 
Transverse view of a naturally-fractured corallite, displaying a tabulum with circum- 
ferential septal nicks. 
Tryplasma, sp. 
Transverse section prepared for the microscope of a corallite of the coral represented in 
PI. XVI, Figs. 1 and 2, showing the thickened wall and septal teeth. — x 2. 
