Maskell. — On New Zealand Desmidieae. 13 



angular. Inflations doubtful, no specimen having been seen 

 without endochrome. 



Long., 11-4 [x] lat., 13-2 /x; crass., 3*2 /x. 



Christchurch. 



If it were not for the concave ends and for the appearance 

 in end-view, this plant would belong more properly to the 

 genus Cosmarium. It is exceedingly minute, and not com- 

 mon. 



* Euastr2im dejiticulatum, Kirchner. Plate II., fig. 11. 



This appears to be one of the innumerable varieties of E. 

 binale, Ealfs. It is the plant of which a rough representation 

 was given by me in 1880 ("Trans.," vol. xiii., pi. xii., 26): 

 the present figure is more accurate. Nordstedt (" Alg. of 

 N.Z.," pi. iii., fig. 11) represents this plant as " sp. act E. 

 denticulatum accedens," and in his fig. 9 he shows Kirchner's 

 original type as a good deal siiialler. The two sizes occur 

 here together. I can detect only one median inflation on each 

 segment in front-view. The side-view which I give is less 

 "ornate" than that of Nordstedt (iii., lie) : it is taken from 

 two specimens observed. 



Hawke's Bay ; Christchurch. 



Euastrum binale, 'Ralis, forma. Plate II., fig. 12. 



This seems to be nearer than the last to the original type, 

 although it does not seem to fit it exactly. 



Christchurch. 



The variations of E. binale would appear to be endless. 

 Ealfs, Lundell, Delponte, Wolle, all give figures which differ 

 a good deal from each other. Especially Wolle describes and 

 figures E. binale as distinguished by the "pouting" of the 

 ends at each side of the terminal notch, this very character 

 being a distinctive one of E. elcrjans. In fact, there is so 

 much difference in these figures that one wonders why some 

 of the plants have not been transferred to other species. My 

 figure 12, which I take to be E. binale because its ends do not 

 exhibit any "pouting," is very similar to one of ^Yolle's 

 ("Desm. of U.S.," pi. xxvii., 25) which he names E. elegans. 



Euastrum nndulosuni, sp. nov. Plate II., fig. 13. 



Frond moderate ; constriction deep, linear ; segments in 

 front-view trapezoidal, tapering directly from the base to the 

 rather wide ends ; sides crenate, each with four equal crena- 

 tions ; ends wide, angles divergent, with minute terminal 

 spines, slightly protuberant towards the middle and emargin- 

 ate ; notch conspicuous ; at the base of each segment is a 

 single median conspicuous inflation, and on the face of the 

 frond a number of concentric verrucose undulations. In side- 

 "view the constriction is shallow and wide, the inflation visible ; 



