ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



283 



Invertebrates three genera of Flagellates occur — LejJtomonas, Herpeto- 

 monas, and Crithidia, with pre-flagellate, flagellate, and post-flagellate 



accident 



forrne 

 Sdiivgire 



Life-history of Leptomonas davidi. 



phases. The differences between the three genera are discussed. In 

 Portugal the vehicle of Leptomonas davidi is, a E.emii>tevon, Ste)iocephalus 



