OOSMARIUM. 193 



cwm-ffynon, Glyder Fach (at 2,200 ft.), and Betliesda, 

 Carnarvonshire ! 



SCOTLAND.- -Loch Inver, Sutherland ; Poolewe and 

 Falls of Connon, Ross ; Brin, Inverness (Hoy 4* Bissett). 

 Rhiconich, Sutherland ! Craio--an-Lochan and near 

 Spittal of G-len Shee, Perth! Mull in Argyll (Burge). 

 New Galloway, Kirkcudbright ! Hoy, Orkneys ! 



IRELAND.- -Donegal ! Galway ! Mayo ! Dublin and 

 Wicklow (Arclier). Down! Antrim! Lough Neagh ! 



Georj)'. Distribution. Germany. Austria. Portugal. 

 Sweden. N. Russia. Greenland. Faeroes. Burmah 

 (var.). Central China (var.). Australia. Central 

 Africa. West Indies. Brazil. 



C. siibtumidum differs from C. tumiduni in the pyramidate 

 form of the semicells and the truncate apices, in the much 

 narrower vertical view, and in the structure of the chloro- 

 plasts. It differs from (7. nitidulum in the form of its semi- 

 cells, which are less trapeziform with more convex sides. It 

 is not an uncommon species in the more upland, boggy dis- 

 tricts of the British Islands, and may sometimes be obtained 

 in quantity. 



Var Klebsii (Gutw.) West & G. S. West. (PL LXIII, 



figs. 21-23.) 



Cosmarium Klebsii Gutw. Flor. ^lonow Galic. 1892, p. 127, t. 3, f . 3 ; 

 West & G. S. West, Al^. S. England, 1897, p. 485 ; G. S. West, Alga-fl. 

 Cambr. 1899, p. 115 ; West and G. S. West, Alga-fl. Yorks. 1900, p. 74; 

 Alg. N. Ireland, 1902, p. 33 ; Further Contrib. Freshw. Plankton Scott. 

 Lochs, 1905, p. 484. 



Basal angles of semicells more widely rounded, 

 and the sides more convergent, making a narrower 

 truncate apex. 



Length 32-41 //,; breadth 29-35 (JL; breadth of 

 isthmus 7-11 /x; thickness 16-18 /x. 



ENGLAND. - - Pilmoor, N. Yorks ! Near Ely and 

 Wicken Fen, Cambridgeshire ! New Forest, Hants ! 



WALES. Llyn-y-cwm-ifynoii, Carnarvonshire ! 



SCOTLAND.- -Not uncommon in the plankton of 

 Inverness, and of Lewis and Harris, Outer Hebrides ! 



IKK LAND. Near Glenties, and Loughs Akibbon, 



7 o 



Gartan, Maofrath, and Nacuro:, Donegal ! LousHi Fea 



7 O 7 O 7 O O 



VOL. II. lo 



