Spencer. — On Fresh- water Algas. 803 



Filament. — Diameter jfa". 

 Length of cell.-^" to ^". 

 Zygospore. — Length, tirs"> breadth, y^d". 

 Diameter of sporiferous cell, yztu"' 

 From Euataniwha. 



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, T iW'- 



Cells.— Length, T y to T -|-/- 



Diameter of zygospore, xoW- 



Length of connecting tube from ¥ ±-jy" to ^V'. 



Also from Euataniwha — 



Bulbochate setigera. 



(Edogonium princeps. 



Vancheria sessilis. 



Rivnlaria 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 13Q°. They all exhibited the motions peculiar to this class 



of AlgEB. 



Fig. 5. (a) Oscillatoria sp., contains a row of cells ; diameter of fila- 

 ment, 5ot>o". (b) Vibrio, alternate dark and light cells ; diam., y^-q-q" ; 

 temp., 105°. (c) Oscillatoria, diam., 70 1 06 / / ; temp., 116°. (d and e) probably 

 the same although varying much in diameter, which is -^^ and -^aW > 

 temp., 116° and 130° ; (/) temp. 136°, diam. 1{k l 06 ". 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 retrogression, I 

 should not have recognized it. (g) Oscillatoria, diam., y^^j"; striae 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.* 



Fvagillaria pectinalis. 



Gomphonema acuminatum. 



Gonium pectinale. 



* Art. XXXI., supra. 



