17 



CORALLINA L. 

 C. officinalis L. 



Stated to be common by Pike, but is rare. 



HILDENBRANDTIA Waido. 

 H. rosea Kiitz. 



Frequent throughout. 



PERIBINIALBS. 

 GYMNODINIACEAB. 



GYMNODINIUM Stein. 

 G. fuscum (Ehrb. ) Stein, 

 Brooklyn Water Supply. 



PBEIDINIACBAE. 



CERATIUM Schiank. 

 C. tripos Nitzscli. 



Brooklyn Water Supply, Bates. Queens ; Cold Spring Harbor, 



Johnson. 

 C. longicorne Perty. 



Brooklyn Water Supply. 



PERIDINIUM Ehib. 

 P. tabulatum Ehib: 



Brooklyn Water Supply. 



C-yANOPHYCBAB. 

 CHROOCOCCACEAB. 



CLATHROCYSTIS Henfry. 

 C. aeruginosa Henfry. 



Queens : Glen Cove. 

 C. roseo-persicina Cohn. 



Queens : Cold Spring Harbor, Johnson. 



COELOSPHAERIUM Naeg. 

 C. Kutzingianum Naeg. 

 Frequent. 

 MERISMOPEDIA Meyen. 

 M. glauca Naeg. 

 Not infrequent. 



NOSTOCACEAB. 



NOSTOC Vauch. 



N. sphaericum Vauch. 



Kings: Greenwood, Hooper. 



