COSMARIIDI. 145 



Length 28-30 p. ; breadth 24-26 p ; breadth of 

 isthmus 5'5-6'5/x; thickness 14'5 15 p. 



ENGLAND.- -Thursley Common, Surrey ! New Forest, 

 Hants ! 



This variety was abundant amonsr Utricularia minor in both 



t/ c3 



the above-mentioned localities. 



10. Cosmarium cyclicum Lund. 

 (PI. LVIII, figs. 8, 9.) 



Cosmarium cyclicum Lund. Desm. Suec. 1871, p. 35, t. 3, f. 6 ; Cooke, Brit. 

 Desm. 1886, p. 116, t. 40, f. 1J ; Hansg. Prodr. Algenfl. Bohm. 1888, 

 p. 196 ; De Toni, Syll. Alg. 1889, p. 983 ; West, Alg. N. Yorks. 1889, 

 p. 293 ; Alg. N. Wales, 1890, p. 290 ; Alg. Eng. Lake Distr. 1892, p. 728 ; 

 Nordst. Index Desm. 1896, p. 9-i : West & G. S. West, Alga-fl. Yorks. 

 1900, p. 69. 



C. Turnerianum Mask. Further Notes N. Zeal. Desm. 1889, p. 18, t. 3, 

 f. 28. 



Ursinella cyclica K/imtze, Eevis. gen. plant. 1891, p. 924. 



Cells of medium size, circular or transversely circular- 

 elliptic, about as long as broad, deeply constricted, 

 sinus very narrow with a dilated apex ; seinicells semi- 

 circular, angles slightly rounded or obliquely truncate, 

 marerin regularly crenate with about 12 crena?. and 



O O e/ 



with two or three parallel rows of small undulations 

 within the margin. Side view of semicell obcuneate, 

 apex rounded-truncate. Vertical view narrowly fusi- 

 form-elliptic, undulate towards the poles, ratio of axes 

 about 1 : 2*2. Cell-wall smooth. Chloroplasts axile, 

 each with two pyrenoids. 



Zygospore unknown. 



Length 49-52 ju; breadth 52-58 /A; breadth of 

 isthmus 17-27*5 ^ ; thickness 25-26 ^. 



ENGLAND. Borrowdale, Cumberland ! Near Bow- 

 ness (Bissett), and Helvellyn ! , Westmoreland ! Mickle 

 Fell, N. Yorks ! 



WALES.- -Capel Curig (Cooke fy Wills), Snowdon!, 

 Llyn Idwal ! , T Foel Eras ! , and Llyn-an-af on ! , Car- 

 narvonshire. 



IRELAND. Dublin and Wicklow (Archer'). 



Geogr. Distribution. France. Germany. Austria 



VOL. II. 10 



