71 (56) Cell attached to lorica only at mouth aperture; only buccal cilia 

 capable of being extended through opening of lorica. Stalk absent. 

 Family LAGENOPHRYIDAE. 



71 (56) Cell not attached to oral end of aperture; entire oral end of body extendable 

 beyond opening of lorica. Stalk present, often short. Family VAGINICO- 

 LIDAE. 



72 (55) Cell motile. 



72 (55) Cell sessile. 



73 



77 



73 (72) Aboral circlet(s) of cilia present 74 



73 (72) No aboral circlet of cilia. Sometimes an equatorial circlet of cilia 



74 (73) Aboral adhesive disc strengthened by skeletal ring. 

 Family URCEOLARIIDAE 



75 



28 



