99 
One marked feature in this coral is the irregularity of the tabulee, 
both in their distance apart and in development. 
Compound calicular budding is very prolific in T. princeps , and takes 
place either from the calice margin of the mature corallite, or is intra- 
marginal, the new corallites soon becoming detached from one another, 
except that fistulae are sometimes seen to connect them. In the cylindrical 
specimen represented in PI. XVII, fig. 1 , there is one large hud ; in portions 
of two other similar specimens, six are apparent. In a smaller ob-conical 
individual (PI. XX, fig. 4), there are no less than thirteen young corallites, 
ten of them actually marginal, and the other three intra-marginal. In 
PL XVIII, fig. 1, are represented the two united portions of a really fine 
example of gemmation, the basal half consisting of three ob-conical corallites 
(PI. XIX, fig. 1), of which the largest is seen to he giving off seven still 
younger individuals, five marginal and two intra-marginal. In the lower 
transverse view of the upper half (PI. XIX, fig. 2), thirteen corallites are 
visible, including the seven already mentioned, the remaining six having 
budded above the level of the fractured half. The upper or growing surface 
of this group (PI. XIX, fig. 3), displays twelve well-developed corallites, the 
thirteenth having been crowded out. 
On the subject of compound calicular gemmation, so beautifully 
displayed in this corallum, Nicholson says : — “The primitive corallite throws 
up from its calicine surface two or more buds, which, after reaching a certain 
size, in most cases repeat the process The necessary result of 
this is, that the aged corallum assumes the form of an inverted pyramidal 
mass, the base of which is formed by the primitive corallite. Prom the 
calice of this the secondary corallites diverge, and the surface of the entire 
mass is flattened or slightly convex. The calices of the secondary corallites, 
and the corallites themselves, may remain more or less completely separate. 
. . . . At other times the corallites are more intimately united by their 
walls, and the corallum becomes truly astrseiform.” 1 This paragraph 
admirably expresses the condition in T. princeps, except that not only are 
the younger corallites connected by their walls for a short length, but at times 
also by fistula). 
It is difficult to imagine that the small buds represented in PI. XX, 
fig. 4, could ever attain anything approaching even moderate dimensions 
as compared with the more highly vigorous parent. Nicholson has suggested 
'Nicholson — Trans. E. Soc. Edinb., xxvii, p. 239. 
