STAURASTRUM. 145 



SCOTLAND.- -Rhiconicli, plankton of Lochs Shin and 

 Nan Cuinne, Sutherland ! Plankton of Loch Shiel, 

 Inverness ! Xear Aboyne, Aberdeen ; Cammie, Kin- 

 cardine (Roy fy Kisseft). Plankton of Loch Fadaghoda 

 and four other lochs in Lewis ; plankton of Loch nan 

 Eun, N. Uist ; and plankton of Loch Mhorgain, Harris, 

 Outer Hebrides ! 



IRELAND.- -Plankton of small lakes between Clifden 

 and Roundstone, and of Lousfli Corrib, Galwav ! 



> 



G-eoyr. Distribution.- -Norway. Sweden. United 

 States. 



This characteristic species is practically confined to the 

 western lake-areas of the British Islands. It is most nearly 

 allied to St. brevispinum, hnt need never be confused with 

 that species, differing in the form of its semicells, in the 

 nature of its sinus, and in the less ret use sides of the vertical 

 view. We regard it as a very distinct species with a very 

 definite geographical distribution. It exhibits little variation 



o r 



except in size. 



14. Staurastrum brevispinum Breb. 

 (PL CXXIII, figs. 1-3.) 



Rinatella brevispina Breb. in Cheval. microscop. et usage, 1839, p. 272. 



Stan, -a strum brevispinum Breb. in Ealfs' Brit. Desm. 1848, p. 124, t. 34, 

 f . 7 a et 6 ; Arch, in Pritch. Infus. 1861, p. 737 ; Rabenli. Flor. Europ. 

 Alg. Ill, 1868, p. 202 ; Kirchn. Alg. Schlesien, 1878, p. 168 ; Wolle, 

 Desm. U. S. 1884, p. 121, t. 53, f. 2, 3 ; Cooke, Brit. Desm. 1887, p. 140, 

 t. 49, f. 4 ; Hansg. Prodi-. Algenn. Bohin. 1888, p. 211 ; De Toni, Syll. 

 Alg. 1889, p 1140 ; West, Add. Alg. W. Yorks. 1891, p. 247 ; Alg. Engl. 

 Lake Distr. 1892, p. 730 ; Liitkem. Desm. Attersees, 1893, p. 563 ; Eoy 

 & Biss. Scott. Desm. 1893, p. 179 (sep. p. 18) ; Nordst. Index Desm. 

 1896, p. 69 ; W. & G. S. West, Alg. S. England, 1897, p. 492 ; Schmidle, 

 Lappmark Siisswasseralgen, 1898, p. 50 ; W. & G. S. West. Alga-fl. 

 Yorks. 1900, p. 97 ; Borge, Siisswasseralgen Sud-Patagon. 1901, p. 27 ; 

 W. & G. S. West, Alg. X. Ireland, 1902, p. 44 ; Freshw. Alg. Orkneys 

 and Shetlands, 1905, p. 24. t, 1, f. 32; Further Coiitrib. Freshw. 

 Plankton Scott. Lochs, 1905, p. 486; Comp. Study Plankton Irish 

 Lakes, 1906, p. 86 ; Borge, Beitrage Alg. Schweden, 1906, p. 44 ; 

 Larsen, Ferskvandsalg. Vest-Gronl. 1907, p. 348; W. & G. S. West, 

 British Freshw. Phytoplankton, etc., 1909, p. 181. 



St. brevispinum forma minor Rabenh. Flor. Europ. Alg. Ill, 1868, p. 202 ; 

 Boldt, Siber. Chlorophy. 1885, p. 113; Larsen, Freshw. Alg. E. Green- 

 land, 1904, p. 96. 



St. muticum Breb. var. brevispinum (Breb.) Jacobs. Desm. Daneni. 1876, 

 p 202. 



St. brevispimim var. minor Roy & Biss. Jap. Desm. 1886, p. 237. 



St. brevispimim forma hexagona Eichl. & Gutw. Nonn. spec. alg. nov. 

 1894, p. 175, t. 5, f. 48. 



VOL. IV. 10 



