;{C2 



SOIL PROTOZOA IX SOUTH AKUICA. 



between the protozoal faunas of virgin and cultivated Karroo soils, 

 the latter being richer in genera and also having a greater total 

 number of Protozoa present. 



A tabular comparison may also be made between the pro- 

 tozoal fauna of Virgin lied Karroo, Cultivated Eed Karroo and 

 Liesbeek soils, all taken at six inches and nine inches deep 

 (Tables III and IV), the fauna of the Karroo (Grootfontein) soils 

 at six inches being taken from last year's results, though the 

 time of the year at which samples were taken differed. 



The soil samples taken at six inches deep may be first 

 considered. 



Table III. 



(1) Soils at () Ixchks Dklp. 



From the table it is seen that Virgin lied Karroo and 

 Liesbeek soils at six inches deep have two Rhizopoda in common, 

 namely. Amoeba Umax and Difflugia globalosa, neither of which 

 is represented in Cidtivated Red Karroo soil at the same deptli. 



In regard to Mastigophora, Oiku)}i()nas icrmo, Bodo (Prowa- 

 zekia) parva and Euglcna viridity are common to all three soils. 



Among the Infusoria, Lacrymaria olor is present in all three 

 soils at six inclies depth. The Liesbeek soil contains more 

 genera and species of Protozoa than the others. It seems, liow- 

 ever, that Oikomonas termo, Bodo (P.) parva, Euglcna viridin and 

 Lacrymaria olor persist in each soil, irrespective of their com- 

 parative physical condition, and may, perhaps, provisionally be 

 considered as normal Protozoal inhabitants of soil at six inches 

 deep. 



The samples of these soils taken at a somewhat deeper level 

 (nine inches) may next be considered. 



