KONOL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 41 



tion (List. Desra. p. 142) the zygospores of St. apiculatum seem to agree well enough 

 with Reinsch's tig. 8 1. c. (»points coniques a large base»). 



19. S. dilatatum Ehrenb. fi obtusilobuin Denot. Desm. ital. p. 53, tab. 4, fig. 47 



(f. 3 — 4-gona). 



Long. 25—27 fx, lat. 28—30 ,«, lat, isthm. 8 ju. Tab. 4, fig. 19. 

 Omatangi (240, 260). 

 Long. 38 ,"; lat. 36 M; lat, isthm. 10 fi. 

 Waimakariri river (2). 



In the fig. of Ralfs Brit. Desm. the rays are truncate, in the form from New Zea- 

 land they are obtuse as described by Meneghini Syn. Desm. p. 227 and by Denot. 1. c. 



20. S. tricorne Menegh. Syn. Desm. p. 225; Ralfs Brit, Desm. tab. 22, fig. 11 a et c; 



Binatella tricornis Bréb. Alg. p. 57, tab. 8. 



Forma plus minus ad Staurastrum hexacerum (Ehrenb.) Wittr. fi semilunare Wittr. 

 Gotl. 01. Sötv. Alg. p. 52 accedens. 

 Long. = lat, 26—34 u. 

 Hutt Valley (60); Maungaroa (61); Wellington (67). 



21. S. dispar Bréb. List. Desm. p. 141, tab. 1, fig. 27. 



Forma semicellulis e vertice visis obtusiusculis, non rotundatis. Long. — lat, 19 ,«. 



Dunedin (27). 



Semicellula una speciminis e Tokano (209) e vertice visa angulis rotundatis lateribus 

 leviter concavis, ut in fig. cit, Brebissonii, altera lateribus fere rectis, angulis subacutius- 

 culis vel obtusiusculis. 



22 S. punctulatum Bréb. in Ralfs Brit, Desm. p. 133. 



Long. 46 — 54 /u; lat, 40—54 u; lat, isthm. 18 ,u. 



Lake Pearson (1). 



I have not met with a,ny form perfectly corresponding with the eui^opean one. — 

 Some specimens from Kohukohu (104) pretty nearly approach to St. punrlul atmn Delp. 

 Desm. ital. tab. 11, fig. 37 — 38 and also to var. subrugulosum Racib. Nonn. Desm. 

 Polon. p. 86, tab. 12, fig. 13. It may herhaps be a new species. Long. 28 ,«; lat, 23 ^ ; 

 lat. isthm. 8 ,«. 



23. S. coarctatum Bréb. List, Desm. p. 144, tab. 1, fig. 29. 



fi snbcurtum nov. var. Tab. 4, fig. 20. 



S. sinu mediano amplo, isthmo lato, paulhim elongato; semicellula' dorso truncata? 

 vel breviter convexa^ (apicibus truncato-rotuiidatis). Latitudo isthmi circ. dimidium dia- 

 metri transversalis cellula\ 



K, Sv. Vet.-Akarl, Hanill. Bd. 22. N:o 8. 



