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University of California Puhlications in Zoology [Vol. 18 



Fig. 1. Diagram of the digestive tract of Euryop'litliaimus convSvus, including 

 the portion between the oesophagus and anal opening. Accompanying this dia- 

 gram is a series of outline drawings (tigs. 2-35) of the characteristic forms of the 

 flagellate, C. euryophtliaJmi, found in the several positions of the digestive tract. 

 Oes., oesophagus; cr., crop; mid. stom., mid-stomach; pyl. exp., pyloric expansion; 

 int., intestine; int. gl., gland of intestine; m. t., malpighian tubules; c, colon; 

 r., rectum. X 1750. 



Figs. 2-3. Forms from the crop. Fig. 2. The initial infective spore. 



Figs. 3-6. Developing crithidias. 



Fig. 7. Binary fission in non-flagellated forms. 



Figs. 8-9. Multiple fission in form of a somatella containing zooids. 



