PLATECXVIII. 



Fig. 136. ParameEcium caudatum, x 250, - - - - 83 



Fig. 137. Paramceciian caudatuni, in conjugation, x 250, 83 

 Fig. 138. Paramtzcium caudahwi, nuclei after conjugation, 



X 250, -------- 83 



Fig. 139. ParavKEciiim bursaria, x 390, - - - §6 



Fig. 140. Paramceciutn trichmm, x 420, - - - - 86 



