THE ALGAE 



Oscillaria limosa, Agardli. 

 Phormidium autumnale, Gomont. 



Family Nostocaceae. 

 Nostoc ellipsosporum, Rab.* Toronto Island, on 



ground in marshy places. 

 " commune, Vauch. 

 " caeruleum, Lyng. 



" pruniforme, Agardh.* Forming dark blue- 

 green or blackish-green floating balls, 

 sometimes as large as a small hen's 

 egg. Don Valley. 

 Anabaena flos-aquae, Breb. 



azollae, Stras.* Greenhouse, in tissues 



of the little floating fern Azolla. 

 Cylindrospermum stagnale, B. & F. 



Family Scytonemaceae. 

 Tolypothrix lanata, Wart. 



Family Rivulariaceae. 



Calothrix fusca, B. & F. 

 Rivularia dura, Roth. 



" natans, Welwitsch.* 



DIATOMACEAE Diatoms. 



Species of the following genera of diatoms have 

 been reported by W. B. Tindall, Esq. : 



Stauroneis, Pinnularia, . Navicula, Surirella, 

 Meridion, Diatoma, Pleurosigma, Epithema, Gom- 

 phonema, Cocconeis, Bacillaria. 

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