90 
themselves; section circular; bases of parent corallitcs pointed, or expanded. 
Radiciform processes occasionally developed, long, stout. Bourrelets feebly 
developed, but represented chiefly by the projecting margins of old calices- 
Calice deep and straight- walled, non-expanding or bell-mouthed. Septal 
lamellae about fifty in number, of two orders, primary and secondary, the 
former short; primary spines well developed, thorn-like, not laterally curved, 
and without lateral denticles ; secondary spines as mere tubercles on the free 
edges of the secondary lamellae. Tabulae very numerous, complete or 
incomplete; the former delicate, close or widely separated, horizontal, oblique, 
or rolling; incomplete forming wedge-shaped, irregular, or lenticular vesicles. 
Gemmation single, calicinal or calicino-marginal, the former at once filling 
the parent calice, the latter springing from the edge of the parent calice by 
an attenuated base; in cither case continuing in the same plane as the parent, 
or immediately diverging therefrom. 
Observations . — This species is a characteristic coral of the Wellington 
CaA^e Limestone, and is interesting as presenting some very instructive 
examples of calicinal gemmation in single buds. 
The corail ites of T. welling lonensis are always simple and solitary in 
the first instance, and do not give rise to sub-composite bunches even to the 
same degree as T. princeps, but by ordinary calicinal budding produce single 
lines of successively developed individuals, but to Avliat extent this Avas 
carried on there is no evidence to show. As the corallites increased in groAvth, 
they took on a more cylindrical and less turbinate appearance, corallites here 
and there becoming twisted, or even bent on themselves. The base of the 
original, or first corallite, is either pointed obtusely or expanded, as if forming 
a base of attachment ; there are no fistulae. Bourrelets, or accretion rings, 
are represented by the edges of old calices where a younger corallite has 
grown rapidly within, possessing much the same diameter as the parent, and 
thus completely infilling it. At times a small peripheral space is left 
between the two, in which the tooth-like septal spines are just visible. The 
deep and straight- walled calice does not appear ever to expand as in T. 
liliiformis. The bottom is usually uneven, from the rolling nature of the 
tabula forming it. 
No opportunity having arisen of examining an absolutely unoccupied 
or perfect calice, the precise number of sepial lamellae is still an open 
question ; but judging from several computations, the total complement 
must have been fifty, more or less. There is a marked difference between the 
