113 (112) One short sucker present. Attached to gills of bivalve molluscs 

 in part by large, flat sole. Family SPHENOPHRYIDAE (also 

 see couplet 111). 



113 (112) Several tentacles present. In various habitats 114 



114 (113) Cell with lorica 115 



114 (113) Cell without lorica 117 



115 (Hi) Tentacles of two definite types. Family EPHELOTIDAE, in part 

 {Actinocyathus, Podocyathiis) (also see couplet 118). 



115 (114) Tentacles all similar 116 



116 (115) Tentacles with enlarged tips, in clusters. Family ACINETIDAE. 



116 (115) Tentacles not clustered. Family PODOPHRYIDAE, in part {Paracineta, 

 Metacineta) (also see couplet 120). 



41 



