54 (1) 



Cilia mostly anteri- 

 or or apical. Circ- 

 lets of simple cilia 

 sometimes occur- 

 ring at the aboral 

 pole or near the 

 middle of the body. 

 Cytostome present. . 



55 



54 (1) Cilia restricted to one surface, or in circlets, parallel oblique rows, isolated 

 groups of rows, or some other arrangement. Cytostome present or absent. . . 



83 



55 (5i) Cell loricate 56 



55 (5i) Cell without lorica 72 



56 (55) Free-swimming, typically planktonic 57 



56 (55) Sessile; lorica attached to substratum 71 



'2C 



57 (56) Lorica with particles of foreign or self-constructed ^^ ^ 



material on surface or within its layers 58 w 's^c 



57 (56) Lorica without particles, but with a superficial reticulated pattern 



or polygonal network 62 



57 (56) Lorica clear; ringed, striated, or simple, but not granulated 



or reticulated 66 



23 



