- 37 - MONOCYSTIS. 



67. Living Animals. Make a fresh preparation in 0-65 per cent NaCl of the contents 

 of the vesiculse seminales of an earthworm. Observe parasites among the developing 

 spermatozoa, and make drawings of the various stages of development, showing : 

 young trophozoites surrounded by tails of spermatozoa ; adult trophozoite ; cysts containing 

 two associating individuals ; cysts containing spore-cases ; boat-shaped spore-case con- 

 taining spores. 



68. Stained Animals. Examine and draw the demonstration specimens of : (a) 

 trophozoite with nucleus ; (b) associating individuals ; (c) spore-ease containing spores. 



