1909.] On Trypanosoma eberthi (Kent), etc. 391 



Infection is probably only effected by food contaminated by fasces con- 

 taining cysts of the parasites. We propose in the course of the summer 

 further investigation in connection between these interesting forms upon 

 artificially infected chicks hatched out in an incubator. 



DESCRIPTION OF FIGURES. 

 [Plate 8.] 



The figures are drawn at a magnification of about 4500 diameters. Zeiss 2 mm. 

 250 mm. tube, and 12 oc. 



Fig. 1. — A form (T. eberthi), showing nucleus, undulating membrane, blocks, and axostyle. 



In typical A forms the free flagellum is longer. 

 Figs. 2 and 3. — B forms (Trichomonas), showing three flagella, undulating membrane, 



staining line under membrane, axostyle and nucleus. 

 Figs. 4 and 5. — C form (Monocercomonas), showing four flagella, cytostome, nucleus, 



and food vacuoles. 

 Fig. 6. — Small rounded non -motile A form. 



Fig. 7- — A form, small, showing blocks and axostyle and nucleus, also indication of undu- 

 lating membrane. 

 Fig. 8.- — Form possibly intermediate between B and C. 



