C. H. Martin and K. R. Lewin 119 



12. Russell and Goi.ding. .7. Agr. Sci. 1913, 5, 27. 

 i:i. Russell and Hutchinson. ./. Agr. Sci. 1909. 3, 111. 

 lb. 1913, 5, 152. 



14. Sherman. Centr. Bah. Par. Abt. n. 1914, 41, 625. 



15. Stein. Der Orgnvismv.f iler Flagplhiteii, 1878. 



DESCRIPTION OF PLATES. 

 Plate II. 



FIG. 



1. Euglypha sji. from fresh fixed film (see p. 112) of cucumber bed. A thecamoeba. 



2. Chilochn sp. from fresh fixed film of cucumber bed. A ciliate. 



3. Flagellate from fresh fixed film of cucumber bed. 



4. Dividing Vahlkampfia soli from fresh fixed film of cucumber bed. A Umax amoeba. 



5. Eiiglypha sp. from fresh fixed film of cucumber bed. A thecamoeba. 



6. Chlamydophnjs sp. from fresli fixed film of cucumber seedling bed. A thecamoeba. 



7. Amoeba gobanniensis from fresh fixed film of cucumber seedling bed. A lamelli- 



podian type of amoeba. 



8. Amoeba sp. Do. 



9. Amoeba sp. Do. 



Plate III. 



10. Vahlkampfia soli from fresh fixed film of cucumber bed. A Umax amoeba. 



11. Vahlkampfia soli stage in division. 



12. AmAieba cucumis from young culture. A lameUipodian amoeba. 



13. Amoeba cucumis late stage in division. 



14. Bodo caudatus from a culture. A flagellate. 



15. Bodo caudatus stage in multiple division. 



Note. These illustrations are designed to assist bacteriologists and others who are 

 interested in soil protozoology to refer the species they wUl encounter to the general type. 

 It is hoped in particular that the organisms vaguely referred to as "Amoebae" may be 

 more definitely distinguished at least into Thecamoeba and Amoeba. The Umax and tlie 

 lameUipodian type of amoebae will almost certainly be among the most successful amoebae 

 found in cultures, and it would be of interest to distinguish them from one another and 

 from other less defined types. The sizes of the protozoa shown varied from 15 to 50 ^u ; 

 but the figures were not drawn to the same magnification. 



{Received December 2lst, 1914.) 



