COSMARIUM. 207 



Hansg. Prodr. Algenfl. Bohm. 1888, pp. 199, 279 ; Boldt, Desin. Gron- 

 land, 1888, p. 27, t. 2, f . 33 ; Gutw. Flor. glonow Galic. 1890, p. 14 ; 

 West, Alg. N. Wales, 1890, p. 289 ; Alg. W. Ireland, 1892, p. 153 ; Alg. 

 Engl. Lake Distr. 1892, p. 727 ; Eoy & Biss. Scott. Desm. 1894, p. 172 ; 

 Borg. Ferskv. Alg. Ostgronl. 1894, p. 11; Nordst. Index Desm. p. 212; 

 West & G. S. West, Wehv. Afric. Freshw. Alg. 1897, p. 121 : Alg. S. 

 England, 1897, p. 488 ; Schmidle, Lappmark Siisswasseralgeii, 1898, 

 p. 126; G. S. West, Alga-fl. Cambs. 1899, p. 217; Liitkem. Desm. 

 Central China, 1900, p. 119 ; West & G. S. West, Alga-fl. Yorks. 1900, 

 p. 76 ; Borg. Freshw. Alg. Faeroes, 1901, p. 226 ; Borge, Siisswasser- 

 algeii Stid-Patagon. 1901, p. 21 ; Bohlin, Flor. Algol, d'eau douce d. 

 Acores, 1901, p. 66 ; West & G. S. West, Alg. N. Ireland, 1902, p. 38 ; 

 Borge, Alg. erst. Eegnell. Exped., II, Desmid. 1903, p. 88 ; Larsen, 

 Freshw. Alg. E. Greenland, 1904, p. 88 ; W. & G. S. West, Freshw. Alg. 

 Orkneys and Shetlands, 1905, p. 20 ; Further Contrib. Freshw. Plank- 

 ton Scott. Lochs, 1905, p. 484 ; Comp. Study Plankton Irish Lakes, 1906, 

 p. 85 ; Borge, Beitrage Alg. Schwedeu, 1906, p. 32. 



C. punctulatum a. typicum Klebs, Desm. Ostpreuss. 1879, p. 37, t. 3, f. 

 50-51 [figures not accuratel. 



Ursinella punctulata Kuntze, Revis. gen. plant. 1891, p. 925. 



Cosmarium polonicum Racib. forma Gutw. Flor. Gloii. Okolic Tarnapola, 

 1894, p. 96, t. 3, f. 31. 



Cells small, a little longer than broad, very deeply 

 constricted, sinus narrowly linear witli a slightly 



t/ i5 t/ 



dilated extremity ; semicells oblong-trapeziform, basal 

 anoies rounded, sides convex and slightly converp-ino- 



O i/ O O 



upwards, apical angles rounded, apex broadly truncate, 

 straight or slightly convex ; cell- wall granulate, 

 grannies small and of a uniform size (23 or 24 visible 

 at the margin), generally disposed in somewhat in- 

 definite vertical and oblique series, in the central area 

 sometimes wanting or reduced, the smooth area (when 

 present) always being indefinite and variable. Side 

 view of semicell circular. Vertical view elliptic, some- 

 times with the slightest trace of an inflation at the 

 middle on each side, ratio of axes about 1 : 1*8. 

 Chloroplasts axile, with one central pyrenoid. 



Zygospore globose, furnished with a number of 

 fairly long, stout spines (about 11 visible at the 

 margin), each arising from a broadly conical base and 



O O t/ 



bifurcate or doubly bifurcate at the apex. 



Length 34-3(3-o/x ; breadth 31-34 ^ ; breadth of 

 isthmus 8'5-11/x; thickness 17-1 8*5 JJL ; diam. zygosp. 

 without spines 42-45 p, ; with spines 65-68 JJL. 



ENGLAND.- -Cumberland ! Westmoreland ! (Bissett). 

 Lancashire (Roy). W., X., and E. Yorks! Cheshire 



