82 SIDNEY F. HARMER. 
which has a maximum diameter of ‘59 mm. The number of 
zoccia has increased, and it will be noticed that the zocecium 
which we have called z? still maintains its axial position in 
the colony. The zoccium between z? and z! may be termed 
z‘, while that between z® and z? will be called z*. It will be 
unnecessary to give special symbols to the other zoccia. 
Growth has, so far, proceeded almost exclusively on the 
distal side of the first three zocecia; but the characteristic 
features of the adult Lichenopora are soon acquired by the 
growth of that part of the margin of the colony which inter- 
venes between them and the disc. In fig. 2 the diverging 
zocecia z! and z* are separated by a quadrangular area which 
is the outer wall of a pyramidal space situated between 2}, 
z°, 2°, and the outer wall of the funnel-shaped colony. In 
fig. 4 this space has become divided into two, and at a later 
stage two or three zoccia will be found between the distal 
ends of z! and z?, and directed in such a way that they radiate 
from z® towards the disc of attachment. The position of these 
zocecia is shown in figs. 5 and 12. Their development has 
taken place simultaneously with the extension of the proximal 
part of the rim of the funnel, which grows in such a way 
as to cover that part of the funnel which intervenes between 
the disc and the open mouth. ‘The rim or basal lamina here 
grows horizontally, keeping in close contact with the wall of 
the funnel, and finally covering it and the disc completely. 
Having done this, it comes in contact with the seaweed on 
the proximal side of the disc of attachment ; and the latter is 
thus completely covered. Growth has not, however, been 
confined to this region. The colony has been increasing hori- 
zontally in every direction, z® forming a centre approximately 
equidistant from all parts of the margin. 
The general nature of these processes will be understood 
by comparing figs. 5 and 7. In the fully formed discoidal 
Lichenopora no trace can be seen from the upper side of the 
proximal part of the funnel ; but it is merely necessary to turn 
the colony over to find that that part persists throughout life, 
without any increase of size, A back view of the adult colony, 
