FIG. 2. TRICHOSPH^RIUM SIEBOLDII (SCHAUDINN) : SCHEMATIC REPRESENTA- 

 TION OF THE LlFE-HlSTORY. (Modified from A. Lang, after Schaudinn.) 



I, Fully developed amphiont ; la and ib, ambulant reproduction by fission 

 (i, binary ; i^, multiple fission) ; 2, schizogony (conitomy) ; 3, escape of 

 spores ; 4, young monont ; 5, fully developed monont ; $a and 5^, ambulant 

 reproduction ; 6, rapid nuclear division by minute mitoses ; 7, conitomy and 

 escape of flagellated swarm-spores ; 8, conjugation (isogamy) ; 9, fusion of 

 nuclei and detachment of flagella of copula ; 10, complete fusion of nuclei of 

 copula; n, first nuclear division and appearance of radial rods in sheath ; 

 12, plastogomy as seen in the living state. 



