117 {IH) Stalk present by which cell is attached to substratum 118 



117 (ll-i) Stalk absent. Cell attached to substratum by broad flat- 



tened surface 121 



118 (117) Tentacles of two definite types. Family EPHELOTIDAE (also see 



couplet 115). 



118 (117) Tentacles all similar 119 



119 (118) Cell beyond stalk elongate, at least twice as long as broad. Stalk usu- 

 ally short. Family OPHRYODENDRIDAE. 



119 (118) Cell beyond stalk less than twice as long as broad, often 

 globular. Stalk often as long as rest of cell 



120 



42 



