76 SIDNEY F. HARMER. 
colony at the outset of its growth as bending to the left. He 
appears to have missed the curious fact that the growth is 
to the left in some colonies, and to the right in others. He has, 
I think, not quite appreciated the way in which the proximal 
part of the colony becomes covered by the growing edge. His 
fig. 7 (pl. x) omits an essential part of the arrangement,—that 
is to say, the actual growing edge shown in my own figs. 3—5. 
Smitt describes the colour of the ovicell as inclining to blue 
(“ till fargen dragande at blatt’). I suspect that this was due 
to the use of a glass which was not quite achromatic. The 
ovicell. is, according to my observations, perfectly white. 
Finally, I must call attention to the small, scattered tubes 
with an even, round mouth which Smitt describes as some- 
times occurring in the colony. These he compares with the 
small tubes of Diastopora hyalina (= D. obelia, Johnst.), 
and suggests that they may have something to do with the 
production of the male generative organs. ‘This suggestion is 
clearly wrong, since the testes are developed inside ordinary 
zocecia. I have not observed these small tubes as a part of the 
Lichenopora, but I think it possible that Smitt may be 
referring to the Infusorian Folliculina, whose tubes are 
commonly found growing on the Lichenopora. 
External Features of the Colony.—Fig. 7 represents a ma- 
ture specimen, with a diameter of 1:92 mm., in which secondary 
thickenings have hardly commenced. The colony is nearly 
circular, and it is surrounded by the delicate calcareous 
‘basal lamina,” which in this particular case is upturned, 
although more usually it is closely adnate to the seaweed. 
The arrangement of the zocecia may be understood by ima- 
gining a number of the quills of quill pens to be arranged 
in an obliquely vertical position, radiating from a common 
centre. Those near the centre will approach the vertical 
position, while those nearer the margin are more nearly 
horizontal. It must further be supposed that the nib of 
each pen is uppermost, or nearer the centre, so that the orifice 
of the tube is completely concealed when the colony is looked 
