218 
.N. amphisbaena, Bory Encycl. méth., 1824. Plankton of Thames 
at Kew, August, 1902. 
N. appendiculata, Ktz. Bac., 93, t. 3, f. 28, et. t. 4, f. land 2. Ve ery 
abundant in all the artificial —— all the year round ; present in 
enormous numbers amongst Oscillaria nigra in lake, September, 
1902. 
Fit exilis (Ktz.), Grun. loc. cit., 558, t. 2, f. 30, d-di: Amongst a 
of Euglenae on moist gravel of laboratory tank, September, 
N. angustata, Sm. Diat.,i., 52,0. 17, f. 156. Amongst MMC 
on earth of flower-pot in temperate fern house, August, 1902. 
N. dicephala, EArb. Inf., 1838, p. 185. Lake and water-lily 
pond, September, 1902. 
Forma minor (length 17 »). Middle tank of water-lily 
house and lake, September, 1902. 
Pinnularia, Ehrb., 1843. 
P. nobilis, Hhrb. Abh., 1840, 20. Middle tank of water-lily 
oue September, 1902. 
P. viridis (Ehrb.), Rabenh. Süssw. Diat., 42, t. 6, f. 4. Plank 
of Thames at Kew, August, 1902 ; side tanks of water-lily Sole 
April, 1902. 
P. radiosa (Kiz.), Rabenh. loc. cit., 43, t. 6, f. 9. Amongst 
Cladophora on banks of lake, January, 1902. 
P. viridula (Ktz.), cane, loc. ie Amongst a mass of Huglenae 
on moist gravel of laboratory tank and amongst Vaucheria on 
earth of flower pot in tentéomle fern house, September, 1902. 
Pleurosigma, Smith, 1853. 
P. attenuatum (Ktz. ), Sm. loc. cit., i, 68, PI. 22, f. 216. Moat, 
May, 1902 ; lake, September, 1902 ; plankton of Thames at Kew, 
August, 1902. 
P. acuminatum (Kfz. " Grun. in Wien. Verh., 1860. Temperate 
house p cake June, 1902; pond, September, 1902. 
Schizonema, Agardh, 1824. 
8. neglectum (Thw.), Rabenh. Alg. Eur., i., 265. Amongst 
Cladophora in temperate house pida. March, 1902. ; 
Gomphonema, Ag., 1824, 
G, tenellum, Kitz. Bac., 8, f. viii, 6 et t. 14, f. vii. 5 et €. 
h, Cladophora i in pond and S ist d tank, September, 1902. 
„G. subramosum, Ag. in Regensb. * Flora,” 1830, f.5 e£ 9. On 
Cladophora i in  waterdily pond, April, 1902. : 
