a 6 
SCOTTISH FRESHWATER PLANKTON. 535 
The Plankton from three of the more Lowland Lochs was not 
rich, and contained no Desmids ; it has therefore been placed in 
a separate table, as it isso very different from the rest of the 
material obtained from the more hilly regions. 
Plankton from Loch Thom, Renfrewshire ; Loch Humphrey. 
Dumbartonshire ; and Loch Woodend, Lanarkshire. 
The material was collected from these three lochs in April, 
1903, by allowing the water near the outlet of each loch to pass 
through the nets for some time. Few species were obtained, 
and this is to be chiefly attributed to the earliness of the season. 
Loch Thom is about one and a half miles in length, and is 
600 ft. above sea-level, with high moorlands at its head. 
a 
 F 
Speci 3 : E Remarks 
pecies. ane 8. 
a A A 
| Chlorophycee. 
Ulothrix zonata, Kitz. ............... sy 
Spherella lacustris, Wittr. ..........- ee eee C0 
| Pandorina Morum, Bory ............-+- ee ee 
| Spherocystis Schroeteri, Chodat ...... jue € 
Phzophycee. | 
Dinobryon Sertularia, Ehrenb. ...... ee eee 
Bacillariez. | 
| Synedra pulchella, Kitz. ............+5- we) 
| Asterionella formosa, Hass. ...........- cece | Cece {| ty be 
> gracillima, Weib. ......... ee | ve | cee | This might readily 
| placed as a slender 
| form of 4. formosa. 
| Tabellaria flocculosa, Kiitz. ...........- ror 
i” Jenestrata, Kitz., var. | 
| asterionelloides, Grun. .-- © | | 
| Letracyclus lacustris, Ralfs ............ J | ce | a with 
| Melosira granulata, Ralfs ............ cece ce | Abundant and wit 
| ‘ | sporangia. 
Myxophycez. | 
| Oscillatoria tenuis, Agh, .....-..0222++ ee OT | 
| Celospherium Kiitzingianuin, Nag. cee ce 
