478 SYNOPSIS 



PAOE 



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 52 



7. Saccharomyces. 



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

 saprophytic ; reproduction by gemmation or by internal 

 fission : acts as an organised ferment 71 



8. Bacteria. 



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

 nutrition saprophytic : reproduction by binary fission or 

 by spore-formation : act as organised ferments : the 

 simplest and most abundant of organisms 82 



11. — Unicellular or Non-cellular Organisms in which there 

 is considerable complexity of structure accomi'anik!) 

 BY Physiological Differentiation. 



a. Complexity attained by differentiation of cell-body. 



9. Paramacium. 



Medulla, cortex, and cuticle : -trichocysts : complex 

 contractile vacuoles : mega- and micro-nucleus : mouth, 

 gullet, and anal spot : conjugation temporary, no zygote 

 being formed, but interchange of nuclear material durinj; 

 temporary union 



106 



ID. Stylonychia. 



Extreme differentiation or heteromorphism of cilia ... 116 



11. Oxytricha. 



Fragmentation of nucleus 120 



1 2. Opalina. 



Multinucleate but non-cellular : parasitism and its results : 

 necessity for special means of dispersal of an internal 

 parasite 121 



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 126 



