E U CI LI A TA , HOW TRICHIDA 



365 



their findings on the encystment of Paramecium. Curtis (1927) 

 gives figures showing the encystment in Paramecium (P. cauda- 

 tum?) (Fig. 157, a-c), while Cleveland (1927) injected Para- 



Fig. 156 Semi-diagrammatic drawings of nine species of Paramecium in oral 

 surface view, showing distinguishing characteristics taken from fresh and 

 stained specimens. X230 (Combined after several authors). 



a. P. caudatum f. P. calkinsi 



b. P. aurelia g. P. trichium 



c. P. multimicronucleatum h. P. polycaryum 



d. P. bursalia i. P. woodruffi 



e. P. putrinum 



