C oralliutt, in F . /()fbesi\ rar. occifleiifa/is. — fiir/i/. 141 
peavance of the old ones might give this impression, while the 
yielding due to tension may be only local. 
The existence of rows of pores on all sides of each cell has 
no bearing on the question of the unilaterality of that cell» 
nor is the number of rows a key to the number of radii of 
gemmation. Any or all of the pores may be developed from 
adjacent corallites. It is not assumed, however, that buds 
are necessarily produced on but one side of each cell through- 
out the corallum, although no instances to the contrary have 
been observed. If a complete gemnuition does occur in Faro- 
>-it,e.s, it may be regarded as a reversional manifestation, and is 
to be looked for in senile or pathologic individuals. 
How far the development observed in Fdrosifes /oyhesi 
holds good for Farosifcs as a genus it is difficult to determine. 
It seems probable hnwever, that in all the globose forms, the 
development is one-sided, and that the four cells, which may 
be termetl the increment of generation, characterize the de- 
velopment of coralla of this form. Variety may occur in the 
order in which these cells are given off, and in the persistence 
with which they are reproduced. On the basis of their mode 
of growth, Favosite colonies maybe roughly divided into den- 
droid, explanate, and globular or hemispherical forms. 
The growth of the globular forms is essentially radial. The 
interstices which consequenth' arise are filled, as fast as they 
appear, by new buds, so that at anj' given point in its growth 
the corallum abounds in small, immature caliccs. It is con- 
ceivable, however, that the divergences might be so distribu- 
ted that all the yotmg cells matured simultaneously, before 
any new ones appeared, or even that this might occur period- 
ically. In this form the number of peripheral buds is com- 
paratively small, and after attaining a certain point, the cor- 
allum depends for its increase almost exclusively on intersti- 
tial germination. This point is reached at an early period, 
and is determined by the form of the ol)ject of support. When 
the peripheral cells rest on the surface, further increase by 
the introduction of new ones is clearly impossible except, 
perhaps, laterally between the old cells. In that case their 
character is uncertain and their number small. 
With the incrusting forms, it is far different, as the growth 
of the corallum is peripheral and the introduction of inter- 
