Smith—Phytoplankton of the Muskoka Region. 
335 
Tetraedron planctonicum G. M. Smith 
.Black (1) (rrr), Butterfly (rrr), Cornell (rr), Cull (1) (rr), Otter (rr), 
Pine (rr), Silver (1) (rrr), Silver (2) (rrr). 
Tetbaedron enorme (Balls) Hansg. 
Cornell (rrr), Rowley (rrr), St. Mary (rrr). 
MICRACTINIUM Fresenius 1858 
Micractinium pusillum Fresen. 
Round (1) (rrr). 
LAGERHEIMIA Chodat 1895 
Lagerheimia subsalsa Lemm. 
Yernon (rrr). 
SELENASTRUM Reinsch 1867 
Selenastrum gragile Reinsch 
Black (1) (rr), Brush (rrr), Cornell (rrr), Pine (rrr), Vernon (rrr), 
White (rrr). 
Selenastrum Bibraianijm Reinsch 
Butterfly (rrr). 
ANKISTRODESMUS Corda 1838 
Ankistrodesmus Falcatus (Corda) Ralls 
Big Dudley (sss), Black (1) (rr), Cornell (rrr), Long (2) (rrr), Nine 
Mile (rrr), Thompson (rr). 
var. mirabilis (W. & G. S. West) G. S. West 
Butterfly (rrr), Silver (1) (rrr), Thompson (rrr). 
Ankistrodesmus convolutus Corda 
Almanach de Carlsbad 1838: 199. pi. 2. fig. 19. 1838. 
Black (1) (sss). 
The chloroplast ol the cells was frequently interrupted and with¬ 
out pyrenoids. 
