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UniversHy of CaUfornia Publications in Zooloyi/ [Vol. 16 



Prowazekia lacertae is a small flagellate, teu to fifteen microns in 

 length. It is pyriform in shape, with the nucleus situated in the 

 broader, anterior half of the body. The blepharoplast, from which 



Figs. 20-22. ProtrazekUi cruzi Hartmann and Chagas, X 2066. Fig. 20. 

 Trophozoite, with nucleus, blepharoplast, parabasal body and flagella. Fig. 

 21. Trophozoite, showing variation in parabasal body. Fig. 22. The same. 



Figs. 23-32. P. lacertae (Grassi), X 2066. Fig. 23. Trophozoite showing 

 no evidence of parabasal body; rhizoplast connecting blepharoplast and 

 nucleus. Fig. 24. Trophozoite showing enlarged blepharoplast. Fig. 25. 

 Trophozoite with still further enlarged blepharoplast. Fig. 26. Trophozoite 

 showing backward migration of the parabasal body: note connecting fibrils. 

 Figs. 27-31. Trophozoites with variously shaped parabasal bodies. Fig. 

 32. Telophase of division; nuclei reorganized; parabasal body not divided. 

 Fig. 33. Division of the parabasal body completed. 



