CARPOPHYTA. 181 
therozoids. Each antherozoid is a long spiral thread of 
protoplasm, provided with two long cilia at one end, by 
means of which they swim rapidly through the water. 
Fra. 99.—A Stonewort (Chara crinita). One half the naturalsize. (From Allen.) 
379. Fertilization takes place by the antherozoids swim- 
ming down the opening at the top of the covering cells 
(Fig. 100, c). The carpogone and its covering now become 
F ia. 100.—Sexual organs of a Stonewort (Chara fra; na a, an antherid; s, 
-spore-fruit; ¢, its crown of five cells; b, fragment of the leaf which bears the 
gexual organs; 8, bractegles. Magnified aboyt 33 times. 
