DIV. I 



THALLOPHYTA 



417 



charged in a mass, still enclosed within the inner layer of the antheridial wall (Fig. 

 360, 2). Eventually set free from this outer covering, the spermatozoids appear as 



FIG. 360. Fucus. 1, Group of antheridia. 2, Antheridia showing escaping spermatozoids. 3, 

 Oogonium, the contents of which have divided into eight egg-cells. U, Contents separated 

 from stalk (st). 5, Liberation of the egg-cells. 6, Oosphere surrounded by spermatozoids. 

 (After THURET. From On MANNS' Algae.) 



somewhat elongated ovate bodies, having two lateral cilia of unequal length and 

 a red eye-spot. The oogonia (Figs. 359 o ; 360, 3) are nearly spherical, and are 

 borne on a short stalk consisting of a single cell. They are of a yellowish-brown 

 colour, and enclose eight spherical egg-cells which are formed by the division 



2E 



