150 l;i;iTISH DESailI.UA('E.K. 



SCOTLAND. Near Falls of Kirkaig, Sutherland ; near 

 Haughton, Alford, and Koynach Moor in Cromar, 

 Aberdeen (Ru;/ n<l ///x.sv//). Orkneys! Shetland s ! 



IRELAND. Galway ! Wicklow ! Antrim (Rnlfr). 

 Down ! 



G< J <>/I>'. Distribution. France. Germany. Galicia 

 in Austria. Hungary. Portugal. Norway. Sweden. 

 Poland. Greenland. China. Madagascar. Central 

 and E. Africa. United States. Patagonia. 



The cells of Cl. lanceolatum are proportionately shorter 

 than those of Cl. armpit in, the outer margin is more convex, 

 and the extremities are more attenuated. The cell-wall is 

 always colourless and striations have not been observed on it. 



Var. parvum West & G. S. West. (PL XVII, fig. 11.) 



Closterium lanceolatum var. parvum West & G. S. West, Alg. S. England, 

 1897, p. 481. 



Cells about half the size of those of the typical 

 form, but otherwise exactly similar. 



Length 183 p ; breadth 21 p.. 



ENGLAND. - - Lindeth, Westmoreland ! Dorking, 

 Surrey ! 



Geogr. Distribution. Central Africa. 



. Closterium Lunula (Midi.) Nitzsch. 

 (PL XVIII, figs. 8, 9.) 



Vilris Lunula Miiller, 1784. 



Mi'Mcria ? Lunula Leclerc, 1802. 



Closterium Lunula (Mull.) Nitzsch, 1817 ; ? Kiitz. Syn. Diat. 1834, p. 596, 



t. 18, f. 80 ; Menegh. Synops. Desm. 1840, p. 231 ; Ealfs, Brit. Desm. 



1.S48, p. 103, t. 27, f. 1 ; Arch, in Pritch. Infus. 18(31, p. 747 ; Eeinsch. 



Algenfl. Frank. 1867, p. 186; Eabenh. Flor. Europ. Algar. Ill, 18(58, 



p. 127 ; Delp. Desm. subalp. 1877, p. 95, t. 16, f . 1-3 ; Kirchn. Alg. 



Schles. 1878, p. 138 ; Wolle, Desm. U.S. 1884, p. 40, t. 50, f. 26 (figure 



bad) ; Cooke, Brit. Desm. 1886, p. 19, t. 8, f . 4 ; Hansg. Prodr. Algenfl. 



Bohm. 1888, p. 179 ; De Toni, Syll. Alg. 1889, p. 831 ; West, Alg. aq. 



clulc. Lusitan. 1892, p. 1498 ; Eoy & Biss. Scott. Desm. 1894, p. 246 ; 



Nordst. Index Desm. 1896, p. 160; West & G. S. West, Alg. S. 



England, 1897, p. 481; Alga-fl. Yorks. 1900, p. 52; Alg. N. Ireland, 



1902, p. 23. 



Cl. Jjiniiilo a. ti/i>ii'inn Klebs, Desm. Ostpreuss. 1879, p. 6, t. 1, f. 1 I. 

 Arthrodia Lunula Kuntze, Eevis. gen. plant. 1891, p. 883. 



