HOW TO KNOW THE FRESH-WATER ALGAE 



16a Colonies small (2-4 cells). Fig. 11 PASCHER1ELLA 



Figure 1 1 



Fig. 11. Pascheriella tetias Korsch. Cells showing 

 eye-spot (lateral) and subflagellar vacuoles at 

 the apex. 



Rare. Is to be looked for in small rain water 

 pools and catch basins of temporary duration. 



16b Colonies of 8-16 cells 17 



17a Cells with 4 flagella, arising from a protuberance at the broad 

 end. Fig. 12 SPONDYLOMORUM 



Fig. 12. SpondyJomorum quaternarium Ehr. 

 a, colony; b. single organism showing 

 posterior eye-spot and subflagellar va- 

 cuoles. 



Pear-shaped cells huddled together with 

 their broad ends all directed the same 

 way; eye-spot is posterior rather than an- 

 terior as in most of its relatives. The 4 

 flagella are difficult of determination ex- 

 cept under favorable optical conditions. 



Figure 12 



17b Cells with 2 flagella. Fig. 13 CHLAMYDOBOTRYS 



Fig. 13. Chlaitiydobotrys gracilis Korsch. A col- 

 ony of individuals with posterior eye-spots. 



Like Spondylomorum (Fig. 12) cells of this 

 colonial organism are closely grouped; have 

 2 long flagella and a conspicuous eye-spot. 



Figure 1 3 



27 



