104 LETTISH DESMIDIACE^]. 



IRELAND. Near Oughterard and Ballynaliincli, Gal- 

 way! Cromagloun, Adrigole, and Upper Lake of 

 Killarney, Kerry ! 



Geogr. Distribution. Norway. Lapland. West 

 Africa. United States. Cuba. 



Some of the American specimens of this variety have 

 reached a length of 268 /n, being 30 times longer than the 

 diameter, thus merging into the next variety. 



Var. elongatum West & G-. S. West. (PI. X, fig. 8.) 



Var. elongatum West & G. S. West, Freshw. Alg. Ceylon, 1902, p. 136. 

 Docidium elongatum West. Alg. N. Wales, 1890, p. 284, t. v, f. 17. 



Cells very elongate, 30-40 times longer than their 

 diameter. 



Length 257-330 /*; breadth 8-9 /i. 

 WALES. Capel Cnrig, Carnarvonshire ! 

 Geogr. Distribution. Ceylon. 



Var. tumidum Wille. (PI. X, fig. 5.) 



Var. iumidum Wille, Norges Ferskv. Alg. I860, p. 51. t. 2, f. 34; Eacib. 

 Norm. Desni. Polon. 1885, p. 61 ; West, Alg. W. Ireland, 1892. p. 129. 



Cells about 5 times longer than the diameter, semi- 

 cells distinctly inflated. 



Length 90-1 02 /u; greatest breadth 15-20/1. 

 IRELAND. Ballynaliincli, Gal way ! 

 Geogr. Distribution. Norway. 



Var. alpimim Racib. (PL X, fig. 9.) 



Var. alpinum Eacib, Noun. Desm. Polon. 1885, p. 61 ; West, Alg. W. 

 Ireland, 1892, p. 130. 



Semicells slightly more attenuated than in the 



O v 



typical form, with the apices triincately rounded ; 

 cells 8-12 times longer than their diameter. 



Length 81-170 /i -"breadth 9-5-15 p. 



WALES. Moel Siabod, and bogs above the Capel 

 Curig lakes, Carnarvonshire ! 



IRELAND. Oorid Longh, Galway ! Cromagloun, 

 Kerry ! 



. Distribution . Poland. 



