DERIVED ORGANIZATION— TAXONOMIC STRUCTURES 159 





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Fig. 88. — Types of Ciliata. A, Amphisia kessleri; B, Uroleptus pisces; C, Histrio 

 pellionella; D, Strongylidium sp. ; E, Oxytricha pellionella; F, Oxytricha fallax. (A, 

 after Calkins; B, C, D, E, after Biitschli ; F, after Stein. j 



