Maskell. — On New Zealand Desmidieae. 315 



The cells are quite straight, aggregated in a single bundle, and radiating 

 from the centre. A mucous envelope may be made out. 



Length of cells, -g^ inch. 



16. Scenedesmus, Meyen. 



8. quadricauda, Turpin. (R. XXXI.) 



Common. 



S. acutus, Meyen. (E. XXXI.) 



Eare. 



S. obliquus, Turpin. (E. XXXI.) 



Eare. 



17. Pediastrum, Meyen. 



This is not, I believe, really a genus of Desmidie^, but as it is referred 

 to in most works on the family I insert it here. 



P. tetras, Ehrenberg. (E. XXXI.) 



Common. 



P. boryanum, Turpin. (E. XXXI.) 



Common. 



Pediastrum sp. indet. 



Common. 



Eesembling generally P. boryanwn, but wanting the long points on the 

 marginal cells. 



I have added a few figures showing species about which I am doubtful, 

 or in which, as remarked in my introductory sentences, there seem to be 

 peculiarities worthy of observation. 



At some future time, if possible, I should wish to enter more fully into 

 the details of these peculiarities, which may have been observed elsewhere 

 but have not been recorded. 



SphcBTozosma filiforme, Ehrenberg. 



Fig. 25. 



Ealfs (Tab. XXXV.) gives a figure of 8. pulchrum, Bailey, an American 

 species. The figure is rough and without much detail, bat shows alternate 

 decrease and increase, " an appearance probably caused by the twisting of 

 the plant." But the Enghsh species are not, says Ealfs, twisted. The New 

 Zealand species certainly is, as I have several times observed, and as my 

 figure shows. 



Euastrum elegants or hinale, Brebisson. 



Fig. 26. 



I give a figure of my plant which, as remarked in the catalogue, may be 

 either of the two European species. 



