272 PROCEEDINGS OF THE CANADIAN INSTITUTE. 



Palmellace.*: — 

 Raphidium, Kg. 



R. polymorphum, Fres. ; Ashbridge's Bay and High Park. It is 

 claimed by some authors that Raphidium is a stage in the 

 development of Pediastrum. 



conjugatje. 



Zygneme.-e — 



Spirogyra, Link. 



S. flavescens (Hass. ), Cleve.; Don Valley. 



S. longata (Vauch. ), Kg.; Ashbridge's Bay. 



S. nitida (Dill.), Link.; Don Valley. 



S. jugalis (Dill.), Kg.; Ashbridge's Bay. 



S. majuscula, Kg. ; Ashbridge's Bay aul Humber. 



S. orthospira (Naeg.), Kg.; Don Valley. 



S. quadrata (Hass.), Petit.; Don Valley. 

 Zygnema, Kg. 



Z. anomalum (Hass.), Kg.; Humber. 

 Pleurocarpus, A. Br. 



P. mirabilis, A. Br.; Plumber and High Park. 

 Desmidie.e— 



Hyalotheca, Ehrb. 



H. dissiliens (Smith), Breb. ; Humber. 

 Desmidium, Ag. 



D. Swartzii, Ag. ; Humber. 

 Penium, Breb. 



P. digitns (Ehrb.), Breb.; Humber. 



P. closterioides, Ralfs ; Ashbi'idge's Bay. 

 Closterium, Nitsch. 



C. gracile, Breb. ; Humber. 



C. Cucumis, Ehrb. ; Humber and Don Valley. 



C. turgidum, Ehrb.; High Park. 



C. striolatum, Ehrb. ; High Park, Humber, and Don Valley. 



C. Dians!, Ehrl>. 



var. arcuatum, Breb. ; Ashbridge's Bay. 



C. acuminatum, Kg.; High Park. 



C. Jenneri, Ralfs. ; Humber. 



C. Venus, Kg. ; Humber and High Park. 



C. Ehrenbergii, Menegh ; Humber. 



C. rostratum, Ehrb. ; Ashbridge's Bay. 



C. Brebissonii, Delp. ; Humber. 

 Docidium, Breb. 



D. crenulatum (Ehrb.), Rab. ; Humber. 



D. Trabecula (Ehrb.), Naeg.; Ashbridge's Bay. 

 Calocylindrus, D. By. 



C. Cucurbita (Breb.), Kirch.; Humber. 



