EXPLANATION OF PLATES 



All figures are of Councilmania lafieuri gen. nov., sp. nov., of drawings from 

 preparations fixed in hot Schaudinn 's fluid and stained in iron haematoxylin. 

 The magnification in all cases is 2500 diameters. 



PLATE 18 

 Free stages of Councilmania lafleuri 



Fig. 1. Small free amoeba with single, broad, hyaline pseudopodium. Sharp 

 demarcation between ectoplasm and endoplasm, very, few vacuoles, and very 

 large nucleus with central karyosome with halo, heavily decolorized. Peripheral 

 chromatin lobed. 



Fig. 2. Free amoeba with clear pseudopodium in early phase of protrusion 

 and one in last phases of retraction fiUed with endoplasm at the opposite end of 

 the body. Small nucleus with fairly heavy peripheral chromatin and large, 

 ragged, slightly exeentric karyosome with narrow halo. 



Fig. 3. Free amoeba with small pseudopodium, chromophile margin at boun- 

 dary of ectoplasm and endoplasm, some food vacuoles with contents, nucleus 

 with continuous thin zone of peripheral chromatin, exeentric karyosome without 

 halo. 



Fig. 4. Large free amoeba with two pseudopodia (below) in the last stages 

 of retraction, a broad one (above) in full extension, and one recently formed 

 (at left); endoplasm vacuolated, ectoplasm more homogeneous; nucleus with 

 irregularly lobed peripheral chromatin, spheroidal, exeentric karyosome with 

 narrow halo. 



[190] 



