Spencer.—On Fresh-water Algse. 808 
Filament.—Diameter 435". 
Length of cell.—,1," to 
Zygospore.—Length, in breadth rho’ 
Diameter of sporiferous cell, yhy". 
From Ruataniwha, 
Zygnema, sp.n. Fig. 4. 
Cells retracted at the ends. Eleven or twelve lines longer than broad. 
Zygospore globular, lodged in the connecting tube, the length of which 
varies considerably. 
Filament.—Diameter, 15s". 
- Cells.—Length, 137" to iły 
Diameter of zygospore, zy". 
Length of connecting tube from 415" to qy- 
Also from Ruataniwha— 
Bulbochate setigera. 
(Edogonium princeps. 
Vaucheria sessilis. 
Rivularia iridis. 
Oscillatoria and Vibrio. 
A series of the last-mentioned plants I found in samples of water from 
the hot springs at Taupo, growing in water the temperature of which varied 
from 105? F. to 186°. They all exhibited the motions peculiar to this class 
of Algæ. 
Fig. 5. (a) Oscillatoria sp., contains a row of cells; diameter of fila- 
ment, soso. (b) Vibrio, alternate dark and light cells ; diam., a 
temp., 105°. (c) Oscillatoria, diam., yoyo ; temp., 116°. (d and e) probably 
the same although varying much in diameter, which is 5455" and yiyo ; 
temp., 116° and 130°; (f) temp. 186°, diam. 44355. This plant is so 
unlike an Oscillatorian that had it not been for the movements, which con- 
sisted of both side-way motion and also progression and Unus I 
should not have recognized it. (g) Oscillatoria, diam., 2455" ; striæ evident, 
close ; temp., 136°. 
I have found about 12 Desmids not hitherto discovered in this country, 
one of which is probably new. My time, however, has not permitted me to 
include them in these notes. Mr. Maskell, of Christchurch, has therefore 
undertaken their description, and they will be found in his paper.* 
- Fragillaria pectinalis. 
Gomphonema acuminatum. 
Gonium pectinale. 
* Art. XXXI., supra, 
