KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 5. 139 



Long. 16, lat. s. unc. 18 — 19, lat. isth. 4 — 5, crass. 10, long. unc. 1.7 — 2, long. 

 coru. 5 u. T. XVII. a. f. 14; a, b W. B. T. ad nat.; cl, e, f, g. ätter Wallich Mscr. 

 X 600; fi. f. 16. 



Wallich in description in Desm. Beng. omita to mention The nracous invest- 

 ment of the filaments, but in Mscr. 44. 45 lie has figured it; from his sketches I 

 jndge the diameter of the mucous coat at 54 — 60 u in front wievr. 



2. 0. Ifere Nordst. (Desm. Brås. p. 206, t. III, f. 84, 18G9; Lagerii. Desm. Beng. p. 5, 

 1888; Iveinscii Contrib. Alg. Fung. p. 93, t. XV, f. 4, 1875; Sphcerozosma serratum 

 Bail. Micr. Obs. p. 36, t. I, f. 14, 1850; Wolle Desm. U. S. A., p. 30, t. IV. f. 7. 

 1884; Xanthidiastrum paradoxum Delp. Desm. Subalp. p. 68, t. III, f. 27 — 33. 1873). 



Long. 17 — 20, lat. s. unc. 22 — 25, lat. isth. 4.5 — 7, long. unc: 3.5 — 4.5, long. 

 corn. 6 — 7 u. Nordstedt 1. c. givcs long. 16 — 19. lat. s. unc. 20.5 — 25, c. unc. 25 

 — 16, diam. tubi mucosi 48 /u. 



{rar />' micracanthum Xordst. Alg. Xonn. p. 3, 1880, non observatum). 



/ minus, n. f. 



Long. 15—16, lat. s. unc. 19 — 20, lat. isth. 4 — 6. long. unc. 3 — 4, long. corn. 

 5— 6 u. 



Both from Lower Bengal. 



My .-pecimens having boen gathered över 30 years ago, and kept in weak spirit, 

 have löst all trace of the mucous tube. The dimensions and tigure of R.EINSCH 1. c. 

 are incorrect, vide Nordst. in Hedwigia p. 67. 1876. In Burm. Desm. p. 635. Mr. 

 Joshua recorda tbat he observed this with zvgospores: I trust he will kindly publish 

 the figure of this conjugation, as it would be of mueh interest. 



3. 0. Nordstedtianuin, Tuener (On Desm. p. 934, t. XV, f. 3, 1885; Xordst. Desm. 

 Bornh. pp. 208, 213, 188&J Cookb Br. Desm. p. 6, t. II, f. 7, 1887; O. inerme Tuu- 

 ner in litt. 1884; 0. Jiliforme Bov and Bisset, Jap. Desm. p. 242. 1886: Nordst. 

 Alg. X. Z. p. 29, 1887; Sphterozosma fiMforme Jacobs. Desm. Danmk. \). 212, Wittr. 

 et Nord. Alg. Exs. Xo. 807; non Qddntella jiliformis Ehrb.). 



Long. 14 — 15, lat. circ. 18, lat. isth. 3 — 4, long. corn. 6 — 7, crass. 10 ,". 

 /? compressum, n. f. 



('ellulis fere tam latis quam longis, minoribus. 



Long. 12 — 13, lat. = long., lath. isth. 2.f» — 3. long. corn. 4 — 5 u. T. XVII, « 

 f. 17 a b;' (3 f. 17 c 



Bengal; Northern Indin. 



In l<s83 I made two gatherings upon Strensall Common, near York. England, 

 which yielded a large number of species of Desmids. These I partly noted in the 

 'Algae of Strensall Common' (Naturalist, Dec. 1883). Part of the collection I sent to 

 Mr. A. W. \\'ills 5 who in litt. said he had observed Sphcerozosma jiliforme therein, 

 to which I replied that I had not noticed any plant answering to Ehrenberg's descrip- 

 tion. When I submitted my specimens of 0. Nordstedtianwm to Mr. J. Roy, in July 

 1886, he informed me that he had not previously observed that it was an Onychonema, 

 but he felt sure that it was the same plant he had deemed to be SphcB. filiforme Ehr. 

 This view is verihed by inspection of Xo. 807 W. and X. Alg. Exsicc. communicated 



