89 
very numerous and close set one above the other in the calice. Tabulae 
complete, at irregular distances apart, but on the whole close set, horizontal 
or slightly oblique, bearing longitudinal scattered spines. Gemmation 
compound, four calicular-rejuvenescent buds ; budding may commence at 
a very early stage. 
Observations. — A very interesting little species, the smallest of our 
Try 'plasma. The remarkable depth of the calice (PI. XXI T, fig. 6) is only 
equalled by the number of septal spine cycles. There appear to be more 
secondary than primary cycles, twelve cycles of the former and ten of the 
latter. The complete tabulae are so closely set that not more than one or two 
cycles could have existed in each old visceral chamber or intertabular space. 
The upper surfaces of the tabulae are minutely spined, and the spines 
irregularly scattered ; this is the third Australian species possessing these 
interesting structures. 
Radiciform processes are confined to one side of a corn llite, leading to 
the belief that in the living state the coral was inclined from the vertical. 
The bourrelets are a prominent feature in T. derrengullenensis , giving 
an irregular, highly crinkled outline to the corallites. Their margins are 
delicately festooned by the fine epitliecal lines passing over the rugae, in a 
measure resembling the European T. tubulatum. 
This, of all our Australian species, approaches nearest in outward form 
to the European T. ( Eholidojiliyllum ) tubulatum , Schl., and also to T. ( Acan - 
thodes) rhizophorus, Dyb., and T. ( A .) Eichivaldi, Dyb. If Lindstrom is 
correct in referring Qyathophyllum radioula, Rominger, to his E ho li d op by l lum , 
it also may possibly prove to be nearly allied to T. derrengullenensis. 
Locality. — Limestone Creek, near Bowning, Parish Derrengullen, 
County King ( A . J. Shearsby — Australian Museum; W. S. Dun- 1 ‘-Mining 
and Geological Museum). 
Tryplasma wellingtonensis, Eth. fit. 
(Plate XYI, Figs. 5-10; PI. XXI, Figs. 11 and 12; PI. XXII, Figs. 2-4.) 
Tryplasma, wellingtonensis , Eth. fil, Rec. Geol. Survey X. S. Wales, 1895, I Y, Pt. 4, 
p. 160, t. 21-22. 
Specific Characters . — Corallum in the early stages simple and solitary 
but by repeated calicinal gemmation in single buds forming strings of 
corallites. Corallites turbinate, or turbinate- conical when young, becoming 
more cylindrical in advanced growth, and sometimes twisted or bent upon 
