172 Roosevelt Wild Life Bulletin 



i-'ig. 



I 



Fig. 



2 



Fig. 



3 



Figs. 



4-5 



Fig 



6 



i-^ig. 



7 



Fig. 



8 



Figs. 



9-10 



Plate 13. Plankton Algae of Palisades Park 



(Figs. 1-2, 7-10 X 460; figs. 3-6 X 230) PAGE 



Gonatozygon aculeatum 143 



Spirotaenia condensata 143 



Closterium lineatum 143 



Closterium acerosum 1 43 



Closterium macilentum 1 43 



Closterium Kuetzingii 1 43 



Pleurotaenium Ehrenbergii 143 



Pleiirotaenium subcoronatum var. detum 143 



