129 



Plate II. 



Figs. A — E. Diagrams to show the development of the septa, pali and 

 coUunella in TrocJiocyatliiis raivsonii. The coralla are represented all of the 

 same size, whereas they are very different, the figures showing the changes with 

 increase in size. The rods of the columella are hollow throughout, the pali of 

 cycles I. and II. shaded, and of III. black. The cycles of septa are marked 

 with Arabic numerals. 



Figs. F — K. Side views of various specimens of Trochocyathits rawsonii 

 (XI.) to show the variation in growth and appearance of the coralla. The lines 

 of growth show well in K. 



Fig. L — Diagram of the calicle of Trochocyathiis ciiidiciilafits. 



Fig. M — Diagram of the calicle of Ceratrodms johnsoni. 



Plate III. 



Coralla of Hetcrocyathus aequicostatus, 



1—8. Type i from dredging I. X i^. 



9 — II. Type i from dredging I. X i. 

 12 — 19. Type 2 from dredging I. X li- 

 20—21. Type 2 from dredging I. X i. 

 22 — 29. Young from dredging I. X if- 

 30 — 32. Young from dredging I. X i- 

 33 — Specimen from dredging VII. X li- 

 34 — The same X i- 



35 — 38. Specimen from dredging I. showing fission or possibly budding. 

 39 — Specimen from dredging V. X 15. 

 40 — 43. Other specimens from dredging V. seated on various shells X i. 



(Published 20th Sept., 1904.) 



E 



