ILLUSTRATION 
PLATE I 
[Figs. 1 and 2 were redrawn from camera lucida drawings of specimens fixed in Bouin's 
piero-aceto-formol solution, and stained with Dobell’s alcoholic iron-hematein. Figs. % 
to 8 were redrawn from sketches made of the living organism during the process of 
feeding. Drawings by Haughwout.] 
Fic. 1. Partially macerated individual showing disklike body, presumably 
_ an erythrocyte, lying in the cytoplasm. 
2. Preparation showing further morphological details. Note the line 
of chromatinic granules lying in the cytoplasm between the 
axostyle and the parabasal. 
Fics. 3 to 7. Successive stages in the ingestion of an erythrocyte by a 
living specimen of Pentatrichomonas. 
Fig. 8. Ingested erythrocyte lying in the cytoplasm at the posterior ex- 
tremity of the parasite, and forming a bulge on the external 
surface,of the body. 
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