322 



Causes and Course of Organic Evolution 



FiG.'lO. — Statues in evolution of the asexual and sexual generations in Red 

 Seaweeds. 1, Bangia alropurparea; 2, Lemanea torulosa; 3, Chantransia sp., 

 4, Batrachospermwn; 5, Nemalion, 6, Dudresnaija; 7, Rhodomela (after 

 Falkenberg); Ic" Chondria (after Bornet). \m. 3m., nionospore, 6, a, tetra- 

 spore; h, female apparatus with carpogone cell bearing trichogyne (/r);/>', 

 spermatium; c'c", earlier and later stages in formation of carpospores from fer- 

 tilized carpogone cells. 



