KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 67 



2. T. lsevis (Kutz.) Ralfs Brit. Desm. p. 146, tab. 34, fig. 3; Closterium laeve Kutz. 



Phyc. germ. p. 132. Cfr. fig. nostr. Tab. 3, fig. 19. 



Lat. 22—32 ^; long. 92—128 ,u; crass. 23— 27 /u. 

 Hokianga (103); Omatangi (166). 



Gen. 18. Closterium Nitzsch. 



1. C. striolatum Ehrenb. Entw. d. Infus. p. 68; Ralfs Br. Desm. tab. 29, fig. 2. 



Lat, 33—36 ,«; strisé 10 in 10 ,u- 



Blueskinbay (34, 35, 40). 



Lat. 35—38 ,u, long. 230—300 ,«; striie 5 in 10 f*. 



Rotomahana (316). 



2. C. deeorum Bréb. List. Desin. p. 151, tab. 2, fig. 39. 



Crass. 30 — 40 ,w, long. 370 — 450 ,«, crass. apic. 8 — 10 ,u. 



Arthur Pass (17), Christchurch (49), Rotomahana (316). 



Taupo (156); long. cell. 400—600 ,u ( = Nordst. Alg. Sandw. tab. 1, fig. 10—11; 

 qu£E forma ad Clost. crassum Delp. Spec. Desm. pag. 217, tab. 18, fig. 22 — 30) (Cl. 

 Ralfsii Bréb. a Delpontii Klebs Form. Desm. pag. 17) valde accedit). 



A few specimens of similar appearance from Kororareka (100) probably belong to 

 this species, although the membrane did not appear to be striated, which may possibly 

 be ascribed to its being colourless. 



Until we have met with zygospores of all these forms and allied species, we are 

 not able to find out their relationship. 



3. C. Limula Menegh. Syn. Desm. p. 231. 



Lat, 100—130 ,«; long. 650—1000 ,u. 



Teremakau et Arahura (22); Bay of Islands (91); Papakauri (109). 



Lat. 80—120 ju; long. 460—600 /u. Cfr. Focke Physiol. Stud. I, tab. 3, fig. 13. 



»b coloratum /? Klebs Form. Desm. pag. 6, tab. 1, fig. c et d. Forma prte longi- 

 tudine crassior (membrana achroa); fortasse }>ropria sit species. — Tab. 3, fig. 26. 



Lat, 50—55 fi; long. 230—280 ,a. 



Castle Hill (9). 



It is only in 2 cells that I have in any measure distinctly seen the disposition of 

 the amylaceous vesicles, and they were then arranged in a single longitudinal series. Klebs' 

 variety seems to me scarcely referable to CL Lunula, and the New Zealand form ought 

 perhaps to have made a separate species, approximative to Cl. acerosum as Avell as some- 

 what to Cl- Selenceum Mask. 



