COSMARIUM. 99 



Zygospore unknown. 



Length. 18-21 /i; breadth 18-22 p.; breadth of isth- 

 mus 4* 5-6' 5 fj. ; thickness 11*5-16 p.. 



ENGLAND. Near Bowness, Westmoreland ! 



SCOTLAND. Near Old Mill, Birsemore Loch, Craiefeii- 



. 



dinnie Farm, Birkhill, and Bogwarfcle in Cromar, 

 Cambus O'May, Dalbagie, and Ballochbirse, Aber- 

 deen ; Cratlies, and Bishop's Dam, Kincardine (Roy 

 Bissett). 



(reoyr. Distribution.- -Qalicia, in Austria. Bosnia. 

 Sweden. Denmark. Finland. Poland. N. Russia. 

 Japan. United States. Brazil. Paraguay (a form). 



We think there is little doubt that C. Clepsydra Nordst. 

 and C. Bicardia Reinsch are forms of the same species. 

 Reinscli's figures are not very good, and that of the front 

 view appears to be somewhat oblique. The slightly produced 

 apices of Reiiisch/s figure are thus accounted for, as the large 

 median inflations are near the apex of each semicell. The 

 nearest relative of C. Clepsydra is C. tithophorum Nordst., a 

 species which is fairly generally distributed in tropical and 

 subtropical countries. 



Another Desmid was described under the name of 

 Cosmarium Clepsydra by Delponte in 1877 (vide ' Delp. Desm. 

 subalp/ p. 8, t. 7, f. 35-36). This plant is regarded by 

 Raciborski as a form of C. integerrimum (Nag.) Racib. (*' Desm. 

 Nowe } 1889, p. 79, t. 5, 35; = ? E nostrum (Cosmarium) 

 integerrimum Nag. ' G-att. einzell. Alg/ 1849, p. 119, t. 7, 

 f. Al). 



113. Cosmarium laeve Eabenli. 

 (PL LXXIII, figs. 8-19.) 



Cosmarium Iseve Kabenh. Flor. Etirop. Alg. Ill, 1868, p. 161 ; Xordst. 

 Desm. Ital. 1876, p. 29, t. 12, f. 4; ? Wolle, Desm. U. S. 1884, p. 62, t. 15, 

 f . 10 ; Cooke, Brit. Desm. 1886, p. 94 ; Hansg. Prodr. Algenfl. Bohm. 

 1888, p. 193 ; Borge, Siissw. Chlorophy. Archang. 1894, p. 26 ; Roy & 

 Biss. Scott. Desm. 1894, p. 104 ; West & G-. S. "West, Alg. Madag. 1895, 

 p. 59 ; Nordst. Index Desm. 1896, p. 153 ; West & G. S. West. Alg. S. 

 England, 1897, p. 487 ; GK S. West, Variation Desm. 1897, p. 386, t. 10, 

 f . 1-6 ; Schmidle, Lappmark Siisswasseralgen, 1898, p. 27 ; Ost-Afrika 

 Desmid. 1898, p. 31; Liitkein. Desm. Millstattersees, 1900, p. 9; West 

 & G-. S. West, Alga-fl. Yorks. 1900, p. 94 ; Bolilin, Flor. Algol, d'eau 

 douce d. Azores, 1901, p. 69 ; West & Gr. S. West, Freshw. Chlor. Koh 

 Chang, 1901, p. 87, t. 2, f . 14; Borge, Siisswasseralgen Siid-Patagoii. 

 1901, p. 24 ; Borg. Freshw. Alg. Fseroes, 1901, p. 221 ; West & Gr. S. 

 West, Alg. N. Ireland, p. 35 ; Freshw. Alg. Ceylon, 1902, p. 165 ; G. S. 



