ox SOIL PROTOZOA. 309 



PAPERS. 



8. Observations on the Cytology of Flagellates and 

 Aaioebse obtained from old Stored Soil. By T. 

 GoODEY, D.Sc.*, Protozoologist, Research Laboratory 

 in Agricultural Zoology, University of Birmingham. 



[Received February 3, 1916; Read March 21, 1916.] 



(Plates I. -IV. and Text-figure 1.) 



Index. Page 



Iiitroductiou 309 



Methods 310 



A. FlAGELLATA. 



(1) Proivazekia (JBodo) saltans, 



(a) Structure 311 



(6) Reproduction 312 



(c) Systematic Position 313 



(2) Tetraniitus spiralis, sp. n. 



(a) Structure 314 



(6) Reproduction 316 



(c) Systematic Position 318 



(3) Spironema mnlticiliatum. 



(a) Structure 318 



(6) Systematic Position 320 



B. Rhizopoda. 



(1) Amoeba laivesiana, sp. n. 



(a) Structure 321 



(6) Reproduction 322 



(c) Encystation 324 



{d) Remarks 325 



(2) Amoeba agricola, sp. n. 



(a) Structure 326 



lb) Reproduction 326 



(c) Remarks 327 



Literature 328 



Explanation of the Plates 330 



Introduction. 



Within the last few years a good deal of attention has been 

 paid to soil-protozoa, owing to the important function ascribed to 

 them by Russell and Hutchinson f in their hypothesis advanced 

 to account for the changes observed on partially sterilising soil. 

 According to these investigators, soil-protozoa act as a factor 

 limiting bacterial activity, and so prevent a normal soil from 

 attaining its full fertility. 



It is of importance, therefore, that we should ascertain what 

 kinds of protozoa are present in the soil and as much as possible 



* Communicated by Prof. P. W. Gamble, P.R.S., F.Z.S. 



t Russell and Hutchinson, Journ. Agric. Sci. vol. iii. pt. xi. (1909), and vol v 

 pt. xi. (1913). 



Proc. Zool. Soc— 1916, No. XXI. 21 



