KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 35 



E. sp., ad priorem speciem et E. binale accedens, sed majus. Quam species, quura nullas cellulas inanes 

 vidi nec dispositiouem granulorum in centro semicellularum, certe determinare uon potui. Cfr. tab. nostr. 3, %. 11. 

 Long. cell. 41 /.i; lat. 30 /.t; crass. 19 ft. 

 Taupo (162). 

 Ålia exempla e Tokano (209) ad E. binale gemdnum magis accedunt. 



11, E. mcrassatum nov. sp. Tab. 3, fig. 12. 



E. ellipticum incisura mediana lineari; semicellulas semiellipticaa basi lata, ambitu 

 8:es undulato-crenatsE, crena basali utriusque lateris ceteris paullo latiore apice subtrun- 

 cata, ad isthinum protuberantia parva praäditie, membrana in latere interiore paullum infra 

 centruin paullum incrassata; a latere visa^ elliptico-obovatie (crenis subgranulatis (?) ut in 

 Cosrn. subundulato Wille); a basi elliptica; inter isthmuin et marginem utrinque protube- 

 rantia parva ornataa. — Species ad genus Cosmariorum valde accedens. 



Long. 30 — 36 ,«; lat. 19 — 22 ,«; crass. 14 fi ; lat. isthm. 6 — 8 /u. 



Waikato river (237); Omatangi (240, 253, 260). 



This species seems to come near to Euastrum Sendtnerianum Reinsch (in Spec. gen. 

 nov. Alg. Fung. pag. 119, tab. 21 C. II and still more to lig. 6, tab. 9 in his Contribut, 

 and to Didymidium Sendtnerianum Reinsch Algenfl. p. lo5, tab. 9, fig. IV) and to cer- 

 tain forms of Cosmarium Meneghenii — especially forma Reinsch Contribut, tab. 12, fig. 

 12 — and Cosmarium impressulum Elfv. Finsk. Desm. p. 13, tab. 1, tig. 9; but it will 

 be known by having a round incrassated spöt in tbe middle of its semicells, as likewise 

 by the inflation at the isthmus. It is shorter than the former species, but longer tban 

 Cosm. Meneghinii. It also resembles Cosmarium subundulatum Wille Bidr. Norg. Alg. 

 p. 27, tab. 1, fig. 9, which nevertheless is twice as large and has more crenations in the 

 margin and more rounded semicells. See also Cosm. Sendtnerianum in Wolle Fr- Alg. 

 IX, p. 3, tab. 47, fig. 30—31. 



Gen. 11. Staurastrum Meyen; Ralfs. 



1. S. sexangulare (Bulnh.) Lund. Desm. Suec, p. 71, tab. 4, fig. 9; Didymocla- 

 don sexangularis Bulnh. Hedw. II, p. 51, tab. 9 A. 1; Didymocladon Stella Mask. 

 Desm. N. Z. p. 308, tab. 11, fig. 9— 10 (?). 



(i productum nov. var. Tab. 4, fig. 1. 



Duplo vel subduplo minus quam forma typica parte basilari semicellularum paullo 

 angustiore, dorso truncato subproducto verrucis emarginatis (ut in «, cfr. Lund. 1. c). 

 Dua? formaj: 



1) radiis superioribus margine 1-, inferioribus 2-denticulatis; long. sin. rad. et proc. 

 31 ,<<; lat. sin. rad. 32 — 34 ,«; lat, c. rad. 52; lat, sin. rad. et proc. 16 — 18 ft; lat isthm. 

 8 ,«. — Tab. 4, fig. 1 a et b. 



2) radiis superioribus margine superiore 2-denticulatis, radiis inferioribus margine 

 superiore 3-, inferiore 4-denticulatis, paullo major ad formam typicam magis accedens. 

 Lat. cum rad. 73 u. Tab. 4, fig. 1 a 1 et b 1 (Staurastrum (Didymocladon) furcigerum 

 Mask. Desm. N. Z. Add. p. 246, tab. 15, fig. 13 ?)J 



Omatangi (form. 1: 240, 248, 253; form. 2: 248); 



