KONGL, SV. VET. AKADEMIENS HANDUNGAR. BAND 25. N:0 5. 125 



series upon the arms; the front v. entirely differs in the basa] portion. The 3 angled 

 form seenis nearest to, but smaller tliau, S. Sekqldi fi Brasiliens*' Börgesex (JDesra. 

 Brås. j). 952, t. V, f. 51); it is also near to the next, than which it is niuch smaller 

 and more depressed. 



88. S. proboscideum (Bréb.) Akcu. (in Ralfs Br. Djesin. p. 139, as S. asperiuu fi probo- 

 scideum, t. XXIII, f. 12 b. e. non a; S. proboscideum Akch. in Prit. Inf. p. 742, 1861), 

 /? altiim Boldt (Sibir. Chloroph. p. 117, t. VI, f. 34, 1885). 



Long. 75—80. lat. G6— 70, lat. isth. 17— 1 ( J /u. T. XVI, f. 46; XXI, f. 6. 

 I think this is quite distinet from S. aspefum; both that species and this one 

 are oniitted from Brébisson's Liste', 1856! 

 Northern India. 



89. S. paradoxum Meyen (Einige nied. Algform. p. 777, t. 43, f. 37, 38, 1828! Micra- 

 sferias staurastrum Kutz. Synops. p. 599, 1833; Phycustruiu jxirai/o.nim Kl tz. Phyc. 

 Germ. p. 138, 1845; Goniorystis (Stai/rastrum) parculoxum Hass. Br. Fr. Alg. p. 354, 

 t. 85, f. 3, 1845). 



« Forma 2 — 3-gona. 



Long. 35—40, lat. 50—55, lat. isth. 4, er;iss. 7, long. proc. 10—13^. 

 (i loDgipes Nordst. (Norg. Desm. p. 35, t. I, f. 17). 



Long 50 — 60, lat. 75, lat. isth. 7, crass. 12, long. proc. 16 — 18 ,«. 



Zvgospora globosa, glabra, colore fusco-brunnea — diametro 12 ,«. T. XV, f. 

 4, «, abde; fi, ef. (abfc after Wallich Mscr. No. 234). 



cc. This seems a rather larger form than that of Kalks, Br. Desm. p. 138; /?. com- 

 pared with the Norwegian form of Nordstedt 1. c. is much more dejiressed, less 

 stout in the body, but of equal expanse of arm. 

 Y depressum, n. x. Processubus fere parallelis. 



Long. 20, lat. 28, lat, isth. 4 /u. T. XV, f. 5. 



90. S. hexacerum (Ehrb.) Wittrock (Gotl. Öl. Sötv. Alg. p, 51, 1872; Desaiidium Jiexaceros 

 Ehrb. Beitr. Erk. Organ. p. 293, 1834; Infus. p. 141, t. X, f. 10, excl. f. f., cfr 

 Wittr.! Bivatella tricornis, Bréb. Alg. Fal. p. 57, t. VIII, 1835! Staurastrum tri- 

 cqrne, Mexgii. Synops. p. 225, 1840; Balfs Br. Desm. t, XXII, f. 11, XXXIV, f. 

 8, 1848). 



Long. 21, lat, 27, lat. isth. 5.5 ,u. 



In Meteorp. p. 12, t, I, f. 11, 1839, Ehrenbebg nanied this form Desmidium 

 hcjuiceros, ut supra; in Verbr. Amer. 1843, p. 46, lie re-names the form (tig. 2, 3 in 

 Baileys list) as D. fridens, and in the same work p. 159 he styles it 1). (fridens) 

 hexaeeros, a singular caprice! Cfr note sul) No. 56. 



91. S. subrotula, n. sp. 8. mediocre, sexta parte latius (juam longum; radiis 5 — 6 pra-- 

 ditum; semicellulis ovato-cuneatis, dorso eonvexis eoronå verrucarum parvarum in- 

 struetis, ventre sinuatis; radiis rectis convergentibus rugatis dentibus minutis praeditis, 

 apice 3 — 4-fidis; centrali parte frondis laevi; sinu bre\issimo, sub-acuto. A vertice 

 visum 5 — 6-gonum, stellatum; centra corona circulari verrucarum ornatum; angulis 

 interne rotunda tis. 



Long. 34, lat. 36, lat, isth. 10 /u. T. XV, f. 7. 



