CHLOROPHYCE.E 



175 



on other seaweeds, consisting of a single layer of 

 cells. 



Usually there is no definite or characteristic 

 arrangement of the cells, but in Ilea, a genus much 



FIG. 54. Letterstedtia insignia. Reduced. 



resembling Enter 'omorpha, and sharing its tubular 

 character, there are groups of four cells arranged in 

 quadrants, and in Entcromorpha longitudinal rows of 

 cells may be traced. The cells contain each only 



