ILLUSTRATIONS 
Plate I 
Balantidium haughwouti sp. nov. 
TEXT FIGURES 
Fig. 1. Oral and excretory apparatus of Balantidium haughwouti. 
2. Cytoplasmic structure and meganuelear and micronuclear relations 
in Balantidium haughwouti. 
3. a, b, and c, Meganuclei of the reticulate type (a, superficial; b, 
middle; and c, deep focus); d, e, and /, optical sections of a 
reticulate meganucleus; g, meganucleus viewed from its convex- 
ity; note the extreme thinness of the “crown” of the nucleus 
under which lies the micronucleus; h, bipartite meganucleus; 
micronucleus partly shown; i and j, meganuclei of granular type; 
k, meganucleus of alveolar type. 
4. a and b. Early stages in inclosure of micronucleus in meganucleus; 
c, later stage. 
5. a, A small meganucleus is present; the micronucleus seems to have 
fragmented; b, the meganucleus and its membrane have dis- 
appeared; the cytoplasm contains chromatinic bodies of unknown 
nature; c, the meganucleus has disappeared leaving a body that 
appears to be its membrane; the micronucleus appears in a 
distinct capsule; d and e, early and late stages showing the 
incurvation of the meganucleus about the micronucleus. 
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