PERIODICITY OF THE PHYTOPLANKTON OF SOME BRITISH LAKES. 
TABLE OF PHYTOPLANKTON EROM [осн Lupwatg. 
Oo uM | 
| 
SPECIES. 
| Chlorophycez. 
(Edogonium sp. (sterile) ........... sse 
| Ulothrix zonata, (Web. & Mohr) Каїїл......................... | 
» subtilis, Kütz., var. variabilis, (Kutz.) Kirchn.... 
| Spirogyra sp. (sterile) ........ eese 
| Mougeotia sp. (sterile) ...... нение e 
Gonatozygon monotenium, De Bary ......... MEME 
Closterium Kützingii, Веб... 
FEuastrum bidentatum, Мат... иене нина линь 
| Micrasterias denticulata, ВтбЬ. .........ccccccccececeesceceeenes 
| Cosmarium ochthodes, Nordst. —....... eese | 
| Xanthidium antilopeum, (Bréb.) Kütz., var. depauperatum, 
| W. & G. S. West 
| Hyalotheca mucosa, Ehrenb. _.................................... | 
| Gymnozyga moniliformis, Ehrenb............ .................. | 
| Gleocystis gigas, (Kütz.) Lagerh. .............................. | 
Bacillariez. 
| Tetracyclus lacustris, Ralfs, var. emarginata _............... 
Tabellaria fenestrata, (Lyngb.) Kütz. п.е | 
| „ Jlocculosa, (Roth) Kütz......................eeeeses. 
| Synedra radians, (Kütz.) Стоп... | 
Ulna, (Nitzsch) Ehrenb. .................... eese 
Asterionella gracillima, Неї... | 
Ceratoneis Arcus, (Ehrenb.) Kütz. var. Amphioxys, | 
(Rabenh.) De Toni 
Eunotia gracilis, (Ehrenb.) Rabenh. .......................... | 
pectinalis, (Kütz.) Rabenh. ........................... 
» — lunaris, (Ehrenb.) Grun, .............................. | 
Gomphonema constrictum, Bhrenb. _........................... | 
intricatum, Kütz. „аа 
” 
” 
G. S. West 
Cocconema cuspidatum, (Kütz.) а. S. West .................. | 
Nitzschia Sigma, (Kütz.) W. бт. ............... нн... 
Surirella biseriata, Bréb............cceec cee eee eens НЫ 
linearis, W. Sm. ........................... ПО | 
Lu 
Myxophycez. 
Anabena Flos-aque, (Lyngb.) Bréb. ........................... 
Oscillatoria Agardhii, Gomont ........... sss 
Flagellata. | 
Dinobryon cylindricum, Imhof .................. ыны | 
| Synura uvella, Ehrenb. ................... сеен 
Peridiniez. 
| Peridinium Willei, Huitf.-Kaas.............. с 
Jan. 
|orrr 
| rrr 
(Orr 
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1908. | 
| | 
Aug. Sept. Oct. | 
| 
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| 
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Feb. 
1909. 
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Mar. | Ap г. 
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