16 Transactions. — Botany. 



The plant which I reported as "Cos. ralfsii, var. ^8" 

 (" Trans.," 1882, vol. xv., p. 239), may perhaps have been a 

 still smaller form of the same plant ; but I have not now any 

 specimens to which to refer. 



■■' Cosviarmm trilohulatuvi, Eeinsch, var. basichondrum, 

 Nordstedt. Plate II., fig. 19. 



Long., 18 fi; lat., 12 /t. 



Otaki. 



My measurements are a little less than those given by 

 Professor Nordstedt (" Alg. of N.Z.," p. 57). 



Cosviarium cordaniim, Brebisson, forma minor. Plate II., 

 fig. 20. 



Long., 30/1,; lat.,15/x; crass., 12 /a. 



Rutherford's Swamp, Otaki. 



I have never seen the original figures of this plant, and 

 have judged from those given of it by Wolle ("Fresh. Alg. of 

 U.S.," pi. Ix.) and by Turner (" Journ. Eoy. Micr. Soc," 

 Dec, 1885). With these it agrees nearly in all but size, and 

 perhaps a little more angular form in side-view. 



'■' Cosmarium repandum, Nordstedt. Plate II., fig. 21. 

 I think my specimens have rather more sinuous sides than 

 the type. 



Cosmarium spcciosum, Lundell, forma genuina. Plate II., 

 fig. 22. 



Long., 50 /a; lat., 26-8 /x; crass., 17 yx. 



Hawke's Bay. 



The dimensions of this plant seem to vary. Wolle says 

 that the American forms are nuich larger than the Swedish. 



Cosmarium spcciosum., Lundell, var, simplex, Nordstedt. 

 Plate II., fig. 23. 



Long., 40-45 /i, ; lat., 28-32 /x ; crass., 15-17 /a. 



Hawke's Bay. 



This plant is less angular than the type ; but I scarcely 

 like to consider it at present as a new variety. Hereafter it 

 may be separated on account of its rounder form.''' 



■■'- Cosmarium sub - spcciosum, var. validius, Nordstedt. 

 Plate IL, fig. 24. 



This plant, in vol. xv. of our "Transactions," I reported 

 as C. spcciosum, var. inflatum. Professor Nordstedt has 

 placed it more correctly as above. 



* Since completing this paper I have received from Dr. Nordstedt 

 a tracing of C. spcciosum, forma intermedia, Wille (" Desm. of Nov. 

 iiemlya"), which appears to be perhaps nearer our plant than the var. 

 sivipUx. 



