86 
surface of a corallite uneven. Septal lamellae strongly developed, sixty to 
eighty in number, primary and secondary ; spines non-denticulate, the 
primary long and acicular, extending well on to the surfaces of the tabulae, 
secondary sjnnes short and thorn-like. Tabulae numerous, close, complete, 
but more commonly incomplete, the former rolling, the latter forming 
lenticular vesicles ; spines freely developed on the upper surfaces of the 
tabulae. Gemmation unknown. 
Observations. — T. columnaris is remarkable as being one of the 
three corals possessing spines on the tabulae, a feature which at once 
separates it from the other species having a similar external appearance. In 
horizontal sections the spines are visible, either as dark spots scattered over 
the surface or as dark rings with a refractive centre. 
Detached pieces of this coral, on external characters only, may easily 
be mistaken for large examples of T. denclroulea , but its highly lenticular 
vesicular tabulae and spines will at once separate them. 
The microscopic structure is interesting. The theca is, as usual, 
indicated by a thin dark circle, and within this is a stereoplasmic layer of 
variable width, although usually wide, and enveloping the septal spines 
unequally in different specimens, Some it encases in a uniform manner, 
rendering them obtuse; in others the stereoplasma accommodates itself to the 
outline of the spines, following their acicular form. This stereoplasma may 
be either homogeneous and structureless, or with the usual wavy cone-in-cone 
appearance. The spines on the tabulae are similarly invested. 
Localities . — Portion I, Parish Boree Nyrang, County Ashburnham 
( C . Cullen — Mining and Geological Museum) : Boree Creek, Portion 2, 
Parish Cudal, County Ashburnham (C. Cullen — Ibid.)-. Quedong, County 
Wellesley (C. Cullen — Ibid.). 
Tryplasma, sp. 
(Plate XIII, Fig. 2.) 
~\ 
Observations. — I am unable to refer these long corallites to either 
T. congregationis, T. columnaris, or T. dendroidea. From external appearance 
only it might easily be placed with the second, but my sections, which are 
not all that could be desired, do not show the presence of spines on the tabulae, 
and there is no trace of gemmation; also, its close entombment in the matrix 
renders a detailed examination very difficult. The specimen consists of two 
