203 
Pandorina, Bory, 1824. 
P. morum, Ehrb. Inf., 53, t. ii., f. 33. Common in the plankton 
of the artificial waters; not observed in the pond; resting-stage 
in water-lily pond, April, 1902; plankton of Thames, August- 
September, 1902. 
Gonium, Müller, 1773. 
G. pectorale, Müll. Vermiwm, 60. Common in the plankton of 
the artificial waters; moat, May, 1902.  Four-celled coenobia 
were very frequently observed. 
2. HYDRODICTYACEAE. 
Hydrodictyon, Roth., 1800. 
*H. reticulatum, d. )Lagerh. “Tank, Kew Gardens ; abundant 
in some years" (Bennett in Journ. Roy. Microscop. Soc. 1897, 
511); *not uncommon in the lake " (Massee !). 
Pediastrum, Meyen, 1829. 
P. boryanum, Turp. Rabh. Alg.,iii., 74. Common in the plankton 
of the artificial waters, 1902; moat, July, 1902; plankton of 
Thames, August, t, 1902. 
Var. granulatum, Kiitz. Amongst Oedogonium and Nitella 
in a glass vessel in the Herb. Dptmt., March, 1902. 
. pertusum, Kütz. Phyc. Germ., 143. Plankton of lake and 
water-lily pond, 1902 ; plankton of Thames, decus 1902 
Var. elathratum, Braun Alg. Unic 93. Plankton of 
pond, lake, and middle tank of late house (15), 1902 ; 
plankton of Thames, rere 1902. 
P. Ehrenbergii (Corda), Braun Alg. Unicell., 97, y fo: 
Moat, July, 1902; middle tank of water-lily house ibd oratory 
pond, September, 1902. 
3. TETRASPORACEAE. 
— Link., 1810. 
T. gelatinosa (Vauch.), Desv. Flor. Anger.,18. Lake, attached 
to the bottom ; common during May-July, 902. 
T. lubrica (Roth.), Ag., Spec. Alg., i., 415, n. 11. megan under 
water on the stonework of the labo oratory tank, June-July, 1902. 
This species BONS suddenly, was very common debug some 
weeks, and then disappeared again entirely. 
nanc N rA 1849. 
*A. bra a, Näg. Einz. Alg., 09, 4 iiA, Lh. *In tenk, 
attached gs a pene of Spirogyra” (Massee H. 
