COSMAE1UM. 95 



Freshw. Alg. E. India, 1893, p. 48, t. 7, f. 21 ; Eoy & Biss. Scott. Desm. 

 1*94, p. 44; West & G. S. West, Alg-. Madao-. 1895, p. 59, t, 9, f. 23; 

 Nordst. Index Desm. 1896, p. 78 ; West & Ci. S. West, Alg. S. England, 



1897, p. 487 ; Borge, Siisswasseralgen Sttd-Patagoii. 1901, p. 25. 

 Didinnidium (Cosmarium) continuum Eeinscli, Algenfl. Frank. 1867, p. 



110, t. 9, f. 3. 



Cosmarium Jleneghinii Breb. var. concinnum Eabenli. Flor. Europ. Alg. 



111, 1868, p. 163 ; Wittr. Skandinav. Desm. 1869, p. 12 : Kirchn. Alg. 

 Schles. 1878, p. 148 ; Hansg. Prodr. Algenfl. Bohm. 1888, p. 195 ; De 

 Toni, Syll. Alg. 1889, p. 938; Schmidle, Lappmark Siisswasseralgen, 



1898, p. 27. 



C. concinnum var. Ixve Wille, Norges Ferskv. Al^. 1880, p. 30, t. 1, f. 12; 



Lagerli. Bidrag Sver. Alsrfl. 1883, p. 54: Nordst. Freshw. Alg. X. Zeal. 



1888, p. 58 ; West, Alg. W. Ireland, 1892, p. 149. 

 C. Meneghinii forma Isevis Boldt in Bill. K. Sv. Yet.-Akad. Handl. xiii, 



1888, p. 31. 

 C. angnlosum var. concinnum (Eabenli.) West & G-. S. West, Freshw. 



Chlorophy. Koh Chang, 1901, p. 91; Alg. X. Ireland, 1902, p. 35; 



Freshw. Alg. Orkneys "and Shetlands, 1905, p. 22; G. S. West, Alg. 



Third Tanganyika Expedit. 1907, p. 119. 



Cells a little smaller than in the type ; upper angles 

 of semicells obliquely truncate or retuse ; sides of 

 semicells sometimes very slightly concave. 



Length 1O5-13 /* ; breadth 8-12 ^-, breadth of isth- 

 mus 2'6-4'5/x; thickness 4'5-6'5/x. 



ENGLAND. Puttenham and Thurslev Commons, 



t/ 



Surrey ! Enbridge Lake, Hants (Roy). 



WALES. Glycler Fawr and Snowdon. Carnarvon- 



/ 



shire (Roy). 



SCOTLAND. Sutherland ! Ross, Inverness, Aberdeen, 

 Kincardine, Forfar, Perth, and Argyll (Roy Bissett). 

 Outer Hebrides ! Orkneys ! Shetlands ! 



t> 



IRELAND. Several localities in Donegal ! Near Fox- 



o 



ford, Mayo ! Derryclare Lough, Clifden, Ballynahinch, 

 and Lakes E. of Lough Bonn, Galway ! Adrigole, 

 Kerry ! Slieve Bearnagh, Down ! 



Geor/r. Distribution. France. Germany. Galicia in 



' ^ 



Austria. Norway. Sweden. Greenland. India. 



i/ 



Australia. Xew Zealand. Madagascar. Central 

 Africa. Uruguay. Argentina. Patagonia. 



This variety can scarcely he separated from C. angulosuin, 

 as it differs only in its smaller size and the retuseness of the 



t/ 



upper angles. The latter are, however, commonly truncate 

 as in typical C. angulosum. In all forms the cell-wall is 

 smooth with no trace of punctulations. 



