220 1UMT1SH DESMIDTACE^E. 



the base on each side, upper part of sides retuse, apex 

 granulate. Vertical view narrowly elliptic, with 

 granulate poles, and with a 5-granulate tumour at the 

 middle on each side. Chloroplasts axile, with a central 

 pyrenoid. 



Zygospore unknown. 



Length 28 JJL; breadth 28 /*; breadth of isthmus 9 //,; 

 thickness 18 p.; breadth of apex 10 JJL. 



ENGLAND.- -Near Bowness, Westmoreland (Bissctt). 

 Rombald's Moor and above Eldwick, W. Yorks! Near 

 the Moorcock Inn, X. Yorks ! Delamere, Cheshire 

 (Roy). Leicestershire (Roy). 



SCOTLAND. Dalbagie near Ballater, and Slewdrum, 

 Aberdeen (Roy fy Bissett). 



IRELAND.- -Near Lough Brin, Kerry ! 



Geogr. Distribution.- -France. Galicia in Austria 

 (var.). Nova Zembla. Greenland. Siberia. United 

 States (r). 



This small species is in its typical form very characteristic. 

 It should be compared with Cosmarium subcrenatum and G. 

 subcustatum forma minor. 



Var. ornatum Wille. (PI. LXXXV, fig. 14.) 



C. Kjellmani Wille var. ornatum Wille, Ferskv. Alg. Nov. Semlj. 1879, 

 p. 42, t. 12, f. 32 ; Borge in Botan. Notis. 1S92, p. 59 ; West, Alg. W. 

 Ireland, 1892, p. 158; Borge, Siissw. Chlor. Archang. 1894, p. 30; 

 Beitriige Alg. Schweden, 1806, p. 42 [forma]. 



A little smaller than the type, with a slightly open 



sinus, lateral maro-ins with 3-4 small bidenticulate (or 







emarginate) warts replacing the normal simple granules, 

 generally with one or two simple granules at the basal 

 angles, central tumour with 4 or 5 vertical series of 

 small granules. Side and vertical views relatively 

 stouter. Chloroplasts with one pvrenoid. 



Length 21-26 M ; breadth 20-24 /i ; breadth of 

 isthmus 6'5-9 n ; thickness 15-16 ju. 



IRELAND.- -Athry Lough, Galway ! 



Geo</r. Distribution. Sweden. X. Russia. Xova 

 Zembla. Japan. 



