478 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 52 



7. Saccharomyces. 



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

 saprophyt.ic ; 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 



II. UNICELLULAR OR NON-CELLULAR ORGANISMS IN WHICH THERE 

 IS CONSIDERABLE COMPLEXITY OF STRUCTURE ACCOMPANIED 

 BY PHYSIOLOGICAL DIFFERENTIATION. 



a. Complexity attained by differentiation of cell-body. 



9. Paramtxcinm. 



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 during 

 temporary union 106 



10. Stylonychia. 



Extreme differentiation or heteromorphism of cilia ... 116 



1 1. Oxytricha. 



Fragmentation of nucleus 120 



12. 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 



