384 SYNOPSIS 



PAGE 



6. Mycetozoa. 



Like Protomyxa, but owing to the presence of nuclei the 

 relation of the individual cell-bodies to the plasmodium 

 is more clearly seen : cell- wall of cellulose 5 2 



7. Saccharomyces. 



Cell-body encysted : cell-wall of cellulose : nutrition 

 saprophytic : reproduction by gemmation or by internal 

 fission : acts as an organized ferment 7 



8. Bacteria. 



Cell-body ciliated or encysted : cell-wall of cellulose : 

 nutrition saprophytic : reproduction by binary fission or 

 by spore-formation : act as organized ferments : the 

 simplest and most abundant of organisms .... 81 



II. UNICELLULAR ORGANISMS IN WHICH THERE is CONSIDERABLE 

 COMPLEXITY OF STRUCTURE, ACCOMPANIED BY PHYSIOLOGICAL 

 DIFFERENTIATION. 



a. Complexity attained by differentiation of cell-body. 



9. Paramcecium. 



Medulla, cortex, and cuticle : trichocysts : complex con- 

 tractile vacuoles : nucleus and paranucleus : mouth, 

 gullet, and anal spot : conjugation temporary, no zygote 

 being formed, but interchange of nuclear material during 

 temporary union 104 



10. Stylonychia. 



Extreme differentiation or heteromorphism of cilia . . 114 



11. Oxytricha. 



Fragmentation of nucleus .... 117 



1 2. Opalina. 



Multiplication of nuclei : parasitism and its results : 

 necessity for special means of dispersal of an internal 

 parasite . . 119 



13. Vorticella. 



A stationary organism : limitation of cilia to defined 

 regions : muscle-fibre in stalk : necessity for means of 

 dispersal in a fixed organism : conjugation between free- 

 swimming micro- and fixed mega-gamete : zygote indis- 

 tinguishable from a zooid of the ordinary kind . . . 124 



14. Zootharnniiim. 



A compound organism or colony with dimorphic (nutri- 

 tive and reproductive) zooids : begins life as a single 

 zooid 133 



