30 BRITISH DESMID1AOEJE. 



Filey, E. Yorks. (subfossil in peat deposit) ! Mickle 

 Fell, N. Yorks! Hants! Devon! (Bennett). 



WALKS.- - Capel Curig ! (Goalee $ Wills), and 

 Snowdon !, Carnarvonshire ! Llyn Coron, Anglesey ! 

 In the plankton of Llyn Ogwen ! 



SCOTLAND.- -Inverness, Aberdeen, Kincardine (Roy fy 

 Bissett) . Shetlands ! 



IRELAND.- -Lakes East of Lough Bonn, Gal way ! 

 Dublin and Wicklow (Archer). 



Geogr. Distribution.- -France. Germany. Norway. 

 Sweden. Denmark. Finland. N. Russia. Nova 

 Zembla. Spitsbergen. Greenland. Central China 

 (form). Ceylon (var.). Australia (var.). E. Africa. 

 United States. Guiana. Brazil. Argentina. Patagonia. 



The zygospore of typical C. globosum has not yet been 

 observed., but that of one of its varieties var. Wolle! West 

 & Gr. S. West is known from the United States (vide West & 

 G-. S. West, < Some N. Amer. Desm/ 1896, p. 252, t. 15, f. 17). 

 This zygospore is angular-globose or irregularly spherical, 

 with a smooth wall, and a diameter from 28 to 34 /z. 



C. globosum is distinguished from C. moniliforme by its rela- 

 tively broader cells and much broader isthmus. It is also a 

 much rarer species than C. moniliforme. 



Forma minor Boldt. 



C. globosum forma minor Boldt, Desmid. Gronland, 1888, p. 16 ; West & 

 Gr. S. West, Alg. N. Ireland, 1902, p. 41. 



Smaller than the typical plant, but otherwise similar 

 and with a circular vertical view. 



Length 16-8-24 /u; breadth 12-15 /u ; breadth of 

 isthmus 10*8-12 p. 



IRELAND. Slievecommedagh, Down ! 



Geogr. Distribution.- -Greenland. 



Var. minus Hansg. (PL LXVIII, figs. 3-5.) 



Cosmarium globosum Biilnh. forma Nordst. Desm. Arctose, 1875, p. 28, t. 7, 



f. 25 [according to Hansgirg]. 

 C. moniliforme var. a Delp. Desm. subalp. 1877, p. 10, t. 7, f. 40, 41 



[according to Hansgirg]. 

 Dysphinctium globosum var. minus Hansg. Prodr. Algenfl. Bohm. 1888, 



p. 243 ; West & G. S. West, Alg. S. England, 1897, p. 491. 



