97 
At first sight, the stem-like portion of the corallites, and the long 
corallites of T. dendroidea would appear to be one and the same. There is, 
however, this marked difference : — In the former the tabulae are almost always 
crowded together, irregular, and, more often than not, vesicular, whilst the 
tabulae of the latter are conspicuous by reason of their comparative regularity, 
horizontally, and rare vesicular nature. 1 freely confess I was for a long 
time in doubt how closely these forms were related to one another, for in 
T. liliiformis the bell-mouthed calices are supported with stem-like con- 
tinuations of unknown length resembling the corallites of T. dendroidea. 
The points relied on for specific separation are chiefly : — (1) Form of 
the corallites ; (2) copious development of radiciform processes. 
Of European species, T. ( Calophyllum) eury calyx, Weissermel, is very 
closely allied here, both in the form of the calyx and method of budding. 
Localities. — Hatton’s Corner, Yass Paver, near Yass, County Murray 
(Geological Department, University) : Derrengnllen Creek, a branch of the 
Yass Iliver, Portion 10, Parish Yass, County King (C. Cullen, TV. S. Dun, 
and A. J. Shearsby — Mining and Geological Museum; A. J. Shearsby — 
Australian Museum) : Barber’s Creek, a branch of Derrengullen Creek, 
Parish Yass, County King ( A . J. Shearsby — Australian Museum) : North- 
east corner of Portion 103, Yass Piver, Parish Warroo, County Murray 
(L. Etheridge — Australian Museum) : Seven miles v r est of summit of the 
Canoblas Pange, near Orange, County Ashburnham (-7. M. Curran — 
Australian Museum) : Parish Barton, County Ashburnham (C. A. Siissmilch — 
Technical College, Sydney). 
Tryplasma princeps, sp. nor. 
(Plate XV, Fig. 1 ; PI. XVIf, Figs. 1-6 ; PI. XVIII, Figs. 1 and 7 ; PI. XIX, Figs. 1-3 ; 
PI. XX; PI. XXT, Figs. 1-9; PI. XXII, Figs. 1 and 10; PI. XXIII, Figs. 1-3.) 
Specific Characters . — Corallum consisting of simple solitary corallites, 
ultimately forming, by repeated budding, sub-compound masses or bunches. 
Corallites cylindrical to cylindro-ob-conical, large, stout, straight or rather 
curved, expanding slowly upwards from a more or less pointed base, attaining 
a length of at least eleven inches, by two and a half inches in transverse 
diameter ; section circular or oval. Epitheca ornamented by close, encircling 
lines. Badiciform processes w r ell developed, large, but irregularly distributed, 
