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FIG. i. Stylonychia 

 mytllu's O. F. M. viewed 

 from the underside. From 

 Arnold Lang's Lehrbuch 

 der Vergleichenden Ana- 

 tomic, somewhat modi- 

 fied, i, upper lip; 2, af- 

 ferent canal of the pul- 

 sating vacuole ; 3, adoral 

 plates; 4, peristome; 5, 

 afferent canal of the pulsating 

 vacuole; 6, right edge of the per- 

 istome; 7, pulsating vacuole; 8, 

 posterior half of the macronucles; 

 9, posterior micronucles; 10, cy- 

 topyge (situated on the dorsal 

 surface); n, anal cirri; 12, tail 

 bristles; 13, ventral cirri; 14, tac- Post 



til cilia; 15, cytostome; 16, pre- 



oral row of cilia; 17, right wall of peristome; 18, anterior half of macronu- 

 cleus; 19, undulating membrane; 20, frontal cirri. 



