CELLULAEIAD^. 



11 



Scrupocellaria (Van Beneden) . Cell with a whip 

 behind, and a sessile bird's-head at the upper and 

 outer angle ; aperture spinous. 



S. scrupea. 



scruposa. Fig. 11 ; n. s. and ; 



12 



Canda (Lamx.). Cell with a whip in a notch in 

 the outer side ; no bird's-head on the angle. 

 C. reptans. Fig. 12 ; n. s. and mag* 



