Maskell. — On New Zealand Desmidieae. 27 



portion of the segment ; a third process is visible either in 

 front or behind at each end. In end-view triangular, the 

 sides slightly convex, angles produced into long processes, and 

 the three processes of the other end are visible alternating 

 with these. The plant has a distinct mucous envelope. 



Long, ex rad., 7-5 /* ; lat., 5 /x; long, rad., 6 /x, ex spin. 



Eutherford's Swamp, Otaki. 



The great transparency of the rays and the minuteness of 

 this plant render it difficult to examine it properly. I am not 

 quite sure that the rays may not perhaps be very slightly 

 rough-edged. I have attached it to S. hrachiatimi, although 

 it is scarcely a third of the size of that plant, and its rays are 

 more slender and rather more sharply pointed. It has also a 

 resemblance to S. Icvispinam, Bisset (" Desm. Winderm."), 

 but that also is much larger, and its rays do not appear to be 

 forked. The distinct mucous envelope of our plant is not, I 

 suppose, a specific character. 



* Staurastrum spencerianum. 



This plant, reported by me in 1882 under the name 5. 

 clepsydra, is considered by Nordstedt as a sub-species of S. 

 connatum, Lundell. The name has to be changed, as that of 

 "clepsydra" had been previously taken. 



Genus Tetmemonis, Ealfs. 



Tetmemorus gramdatus, Brebisson, forma minor. Plate V., 

 fig. 49. 



I attach this plant to this species, instead of to T. Icevis 

 (also occurring in New Zealand), as its form is the same on 

 £dl sides and it has the lip-like process of the type. 



Long., 130-150 /x ; lat., 30-35 yx. 



Otaki. 



* Tetmemorus brebissonii, Ealfs. 



Specimens of this plant from Otaki, where it is fairly 

 plentiful, in company with the last species, do not show the 

 tapering of the ends from which Professor Nordstedt has 

 established his New Zealand variety, atteiiuatus. 



Genus Penium, Brebisson. 



* Penium cucurbitinnm, Bisset, var. sub - poly morphum, 

 Nordstedt. Plate V., fig. 50. 



Long., 75 fx; lat., 37 /x. 



Christchurch ; Hawke's Bay ; Otaki. 



Professor Nordstedt establishes his variety only on account 

 of the fact that the zygospore of the European plant has nofc 

 been yet discovered. He figures the zygospore of our New 

 Zealand form as quadrate : I have not seen it. 



