64] 



The Classification of Lower Organisms 



Organisms producing motile cells with paired unequal flagella which Vlk (1931) 

 found to be respectively pantoneme and acroneme, differing from Ochromonadalea 

 in being of a green or yellow-green color, and in being mostly of algal body type, 

 i. e., walled and non-motile. The cell wall consists usually of two parts which become 

 separate when the cell divides; the two parts are believed to be distantly homologous 

 with the wall and pRig of the statospores of Ochromonadalea and Silicoflagellata 

 (Pascher, 1932). The storage products are oil and sometimes leucosin. 



As this is the group to which the class name Heterokontae was first applied, it is 



f-'^y-'v'^^^; ■■■• >i%'X°-^'^^ 



Fig. 10. — Vaucheriacea: a, b^ Chlorosaccus fluidus, cells of the colony and zoo- 

 spores, after Luther (1899). c, d^ Chlorarnoeba heteromorpha x 1,000 after Bohlin 

 (1897). e, f, g. Cell, empty cell, and zoospores of Characiopsis gibba x 1,000 after 

 Pascher (1912). h, Dioxys Incus after Pascher (1932). i, j, k, Cell, edge of cell, 

 and statospore of Pseudotetraedron neglectum x 1,000 after Pascher (1912). 1, Spi- 

 rodiscus fulvus x 1,000. m. End of a filament of Tribonema bombycina x 1,000. 

 n, Antheridium and oogonia of Vaucheria Gardneri x 100. o. Filament of Vaucheria 

 sessilis x 100. 



