ILLUSTRATION 
Plate I 
[Figs. 1 and 2 were redrawn from camera lucida drawings of specimens fixed in Bouin's 
picro-aceto-formol solution, and stained with Dobell’s alcoholic iron-haematein. Figs. 3 
to 8 were redrawn from sketches made of the living organism during the process of 
feeding. Drawings by Haughwout.] 
Fig. 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. 
Figs. 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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