Feb., 1921] Algal Food of the Gizzard Shad 



119 



TABLE III— Continued. 



Notes on Some Algal Forms. 



Peridinium aciculiferum Lemm. 



A number of stages in the life history of this form were 

 observed, besides the ordinary vegetative cells: thick walled 

 resting spores, thin walled resting spores, and the encysted 

 state. 



Pleodorina illinoiensis Kofoid. 



The presence of somatic cells in the anterior region of the 

 coenobium was observed in most of the specimens examined. 

 In some cases, however, no differentiation could be noted in 

 the cells, and it was not always possible to separate this alga 

 from Etidorina elegans. 



Eurodinella wallichii (Turner) Lemm. 



The definite arrangement of the cells as described by 

 Fritsch^ seems to warrant the retention of this alga as a distinct 

 genus of the Volvocacece. 



