COSMAUIUM. 13 



concentric series of flattened granules; vertical view 

 oblong-elliptic, poles 6 7-undulate. 



Length 48 /n ; breadth 42 JJL ; breadth of isthmus 

 15 /x; thickness 23 p. 



ENGLAND.- -Baildon and Boston Spa, W. Yorks ! 

 Wimpole Park, Cambridgeshire ! 



Geogr. Distribution..- -Norway. 



229. Cosmarium coronatum Cooke & Wills. 

 (PL XCVIII, fig. 8.) 



Cosmarium coronatum Cooke & Wills in Cooko, 'Notes on Brit. Desmids,' 

 Grevillea, 1881, ix, p. 90 ; Wills in Midland Naturalist, 1881, iv, p. 74, 

 t. 5, f. 2 ; Cooke, Brit. Desni. 1887, p. 108, t. 41, f . 7 ; De Toni, Syll. 

 Alg. 1889, p. 1023 ; Nordst. Index Desm. 1896, p. 83. 



Ursinella coronata Knntze, Revis. gen. plant. 1891, p. 924. 



Cells of medium size, a little broader than lono- 



* O ? 



deeply constricted, sinus narrowly linear with a slightly 

 dilated extremity ; semicells transversely subrect- 

 angular-trapeziform, angles rounded, sides upwardly 

 diverging, apex broad and slightly convex. Side view 

 of semicell depressed-globose, with a subtruncate apex. 

 Vertical view elliptic, ratio of axes about 1 : 1'8. 

 Cell-wall coarsely and somewhat distantly granulate, 

 granules rounded, arranged in three transverse series 

 (about 8 in each series) and with 15 or 16 visible at 

 the margin of the semicell. 



Zygospore unknown. 



Length 65-70 p. ; breadth 75-80 p, ; breadth of 

 isthmus 20 ju, ; thickness 45 p. 



WALES.- -Capel Curig, Carnarvonshire (CoolceSf Wills). 



Weliave never seen this species, nor, in fact, any Cosmarium 

 with a granulation sncli as that described and figured by 

 Messrs. Cooke and Wills for C. coronatum. 



230. Cosmarium conspersum Ralfs. 

 (PL XCIX, figs. 1, 2.) 



Cosmarium conspersum Ralfs, Brit. Desni. 1848, p. 101, t. 16, f . 4 ; Arch, in 

 Pritch. Infus. 1861, p. 732; Eabenh. Flor. Europ. Alg. Ill, 1868, p. 

 159 ; Cooke, Brit. Desm. 1887, p. 101, t. 39, f. 1 ; De Toni, Syll. Alg. 

 1889, p. 998 ; Borg-e, Chlor. Norska Finmark. 1892, p. 9 ; West, Al^. 

 W. Ireland, 1892, p. 152 ; Alg. Engl. Lake Distr. 1892, p. 726 ; Liitkem. 



