1908.] 



The British Freshwater Phytoplankton. 



189 















a 





CO 











* — ^ 





CO 



. M 





m 



m 



© 





Species. 



isli la] 



leys i 

 .etlanc 



and 

 eland. 



ih laki 



ish la] 



cS . 

 & — s 





o 











to . 

 o M 





o 



m 



O 











Elag-ellata. 

















X 





X 











T 





X 



X 



X 







X 







x 









X 





X 









,, „ var. angulatum, Leumi. (p) 



X 













„ ,, var. diverges (Imhof.), Lemm. (p) 



X 



X 



X 



x 



x 



X 



„ „ var. ScJiarAnslandii, Lemm. (p) 



X 





X 









X 





X 



X 



X 





„ „ var. und ulatum, Lemm. (p) 



X 



X 



X 



x 



x 







X 







x 





X 





X 













„ ,, var. thyrsoideum (Chodat), Lemm. 

 (P) 





— 



X 



— 



— 



X 











X 









Halobryon Lauterbornii, Lemm. (p) 



X 













X 























x 







X 



X 



X 











X 





X 















X 









Diplosigopsi-i frequentissima, Lemm. (p) 



X 









X 





X 





X 



X 







Bicoeca laeustris, J. CI., var. longipes. Zacli. (p) 







X 



X 







Cryptomonas erosa, Elirenb 







X 









Lepocinclis ovum (Ehrenb.), Lemm., var. punctato- 







X 









striatum, Lemm. 















JEuglena viridis, Ehrenb 



X 



X 



X 



X 







T*T?"RT'nT1\rTT7 



X ■ ' ; I 1 J_'l - > / i». 



















— 



X 























,, „ var. major, Lemm. (Pv) 







X 









Glenodinium pulvisculus (Ehrenb.), Stein (p) 



X 





X 







X 



Ceratium cornutum (Ehrenb.), Clap, and Lachm. (p) 



X 



X 



X 



X 



X 







X 













„ hirundinella, 0. P. Miiller (P) 



X 



X 



X 



X 



X 



X 







X 















X 







X 





X 







X 



X 





„ limbatum (Stokes), Lemm. (p) 







X 











X 













„ tabulatum (Ehrenb.), Clap, and Lachm 



X 



X 



X 



X 



X 



X 





X 















X 













Willei, Huitf.-Kaas. (P) 



X 



X 



X 



X 



X 



X 



The above list includes the species of the lake-plankton only, and the 

 Flagellata are very incompletely recorded. 



Were the species of the helioplankton of large ponds, pools, and ditches 

 also included, many of the Protococcacete (or Autosporacese) would have to- 



