Observations . — The corallum of T. liliiformis is never compound in 
the strict sense of the word, nor can it he described as fasciculate, but the 
corallites appear to lie aggregated into loosely constructed colonies. The 
corallites are remarkably persistent in form, resembling the calyx of a 
liliaceous plant on a stem. They are more or less erect, sub-parallel, and not 
twisted or tortuous. The radiciform processes are freely developed and often 
long (PI. X1Y, fig. 3; PI. XXVII, fig. 1), for, irrespective of those attached 
to corallites, the surfaces of matrix hand-specimens are dotted with numerous 
portions and cross-sections of these rootlets ; fistulae proper appear to be absent. 
The bell-mouthed calices are deep, in a few examples very deep, and 
in their lower portions straight- walled within. No other species of this genus 
appears to possess this form of calice so distinctly marked. Some of the 
bell-mouths attain to two and three quarter inch in diameter (PI. XXVII, 
fig 1). 
The greatest number of septal lamellae counted in the calices is eighty, 
but in the stem-like portions the number is less. The difference in length of 
the primary and secondary spines is but slight ; neither curved spines nor 
lateral denticles have been observed. 
The tabulae are very numerous, the complete floors regular as a rule, 
often wide apart, and not spined. When the plane of a cycle of septal spines 
is coincident with that of a tabula, peripheral nicks are left on natural 
transverse fracture. The vesicles formed by the incomplete tabulae vary 
much in shape when seen in longitudinal section, but the elongate lenticular 
outline predominates. 
In a transverse section prepared for the microscope, the proper wall 
when preserved appears as a thin dark circle, with an inner zone of wavy 
stereoplasma encasing the septal laminae. In a longitudinal section the 
primordial line of the tabulae is sometimes visible, and there is always a 
secondary thickening of greater or less extent ; the stereoplasma of the wall 
and that of the tabulae are one, and continuous without a break, but that of 
the wall investment is distinctly wavy and that of the tabulae laminar. 
T. liliiformis possesses some characters in common with T . wellington- 
ensis, but the following points will separate them : — (1) The Wellington species 
does not possess the same stem-like prolongation ; (2) the calices are not 
bell-mouthed; (3) Gemmation is by single buds only; (4) the young coral- 
lites at once become turbinate, or some slight modification of this ; (5) the 
distinction between the primary and secondary septal spines is very marked. 
