CHLOROPHYCE 4 135 
the older parts. The chromatophores are oval, 
and in some species contain a pyrenoid, in others 
not. 
The Reproductive Organs.—In Bryopsis the gametes 
are produced on different plants within the lateral 
leaves, which undergo no modification to this end 
beyond the separation by a cross-wall or stopper from 
the stalk. They are of two sorts; the smaller male 
gametes being elongate and orange-coloured except 
at the anterior end, the female much larger and 
green, with a red spot between the green contents 
and the colourless portion. They are both biciliate. 
Sometimes the female gametes have a spike-like 
projection from the posterior end. In Codiwm the 
gametes are borne in lateral ovate sporangia (game- 
tangia) arising from the club-shaped pallisade cells 
and lying among them, but never projecting beyond 
them (Fig. 350). They are separated at the base 
by a cross-wall or stopper. The gametes are here 
also of two sorts, large green ones (female) and 
smaller yellow ones (male), both biciliate. 
Conjugation has not been observed in either 
genus, but is extremely probable from the fact that 
Berthold’s experiments in cultivating the green 
gametes were never successful, unless when these 
were mixed with the smaller ones. Analogy points 
also to this interpretation of their character. If this 
be so, we possess in the Codiacew a valuable link 
between Vaucheriacew and the other multinucleate 
orders. Codiacee would thus occupy to Vaucheriacece 
much the same position as Cutleriacee to Fucaceee 
among the olive-brown seaweeds. As for non-sexual 
