HELEOPLANKTON OF THREE BERKSHIRE POOLS. 
List of Algo. 
ecc=abundant, ce=common, early c common, 
r= few, rr=rare, rrr— very rare 
Temperature in ^C. ........ 
CHLOROPHYCE.E. 
Pandorina morum (Müll.), Bory .............. TEE 
Eudorina elegans, Ehrenb. ,................. TOP: 
Volvox aureus, Ehrenb. ......,....,.....,,,...,,,,.. 
Pediastrum duplex, Meyen ...... En 
" tetras (Ehrenb.), Ralfs. TEE 
Crucigenia rectangularis (Naeg.), Gay ... .......... 
» Tetrapedia (Kirehn.), W. & G. S. West | 
» minima (Fitschen), Brunnthaler ..... TEM 
Scenedesmus quadricauda (Turp.), Bréb, ...... . . 
» bijugatus, var. arcuatus (Lemm. ) G. S. West 
Ankistrodesmus falcatus (Corda), Ralfs............ Lae 
Kirchneriella obesa (West), Schmidle .................. 
Oocystis parva, W.& G. S. West .......... TEE 
» solitaria, Witt. ...,.,... ..... oe tee rar etree 
Nephrocytium obesum, West .........,,,,,..... nos 
Tetraedrun minimum (A. Br.), Hansg. ..,,............ 
5 tr igonwn (2 (Naeg.), Hansg. ......... ees su 
" muticum (A. Br.), Hansg.. TEE . 
" hastatum, var. palatinum (Sehmidle), Hansg. 
LE 
Spherocystis Schroetert, Chodat ...................,.. 
Gleocystis gigas (Kütz. 3, Lagerh, Fosses 
Closterium aciculare, T. West, var. subpronum, G. S. West 
Pleurotenium Trabecula ( Ehrenb. )»Naeg. ........... 
Enastrum verrucosum, Ehrenb., var. coarctatum, Delp. . 
Micrasterias papillifera, Bréb..............., etta 
Cosmarium abbreviatum, Racib. ......,,......,,...,.. 
bioculatum, Bréb. ...... ete eee ene eens 
22 
Phaseolus, Bréb. .,.........,......,...... 
regulare, Kütz., var. Incus, Teiling ............ 
Lagerheimia wratislaviensis, Schroeder ....... ee eee 
Dictyospherium pulchellum, Wood......... EN 
” 
5 turgidum, Bréb.....,,..,,.,...,,,,,,...,,. 
" marga itiferum, Menegh, ......,..,.....,.. 
" ovale, Ralfs. ........,,......,...,,,...... 
Meneghinit, Breb. .......... TOPPED 
Xanthidium antilopeum (Bréb.), Kütz. .......... rn 
| Arthrodesmus bifidus, Bréb., var. truncatus, West ...... 
Staurastrum Bienianum, Rabenh.  .................. 
” alternans, Bréb, ........ ran 
» cuspidatum, Ralfs .......... eher ntn 
5 Fureigerum, Dréb. ... . TEM 
, teliferum, Ralfs ,.,,......,.........,.. e. 
North Pool. 
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