W. WEST AND G. S. WEST : ALGA-FLORA OP YORKSHIRE. 7^ 



322. Cosmarium undulatum Corda. 

 S.W. — Rawcliffe Common. Cullingvvorth. 



Mid VV.— Rombald's Moor. Ilkley (W. H. Dikes). Malham 

 Tarn. 



N.W.— Mickle Fell. 



N.E.— Strensall. 



S.E. — Riccall Common. Peat deposit, Filey. 



Var. minutum Wittr. 

 N.E.— Strensall ! (W. B. Turner). 



323. Cosmarium minutissimum Arch. 

 N.E. — Pilmoor, near Thirsk (with zygospores). 



The semi-cells were somewhat flattened at the apex, and the 

 zygospore was rhomboido-elliptical. Length, 8'4 ju. ; breadth, 

 8'5 /i ; breadth of isthmus, 27/i; length of zygospore, 12/x; 

 breadth of zygospore, 10 ju. 



324. Cosmarium Scenedesmus Delp. 

 Mid W. — Malham Tarn. 



S.E. — Skipwith Common. 



325. Cosmarium sphaeroideum West. 

 N.E. — Strensall Common. 



326. Cosmarium trachydermum West & G. S. West. 

 Mid \V.— Cowgill Wold Moss, Widdale Fell. 

 Previously unrecorded for the British Isles. 



327. Cosmarium bioculatum Br(5b. 



S.W.— Rawcliffe (H. F. Parsons). Halifax. In horse-trough, 

 Allerton, near Bradford. CuUingworth. 



MidW.— AdelBog. Rombald's Moor. Malham Tarn. Bog 

 two miles south of Clapham. 



N.W.— Mickle Fell. Great Shunnor Fell. 



N.E.— Strensall. Pilmoor, near Thirsk. Carlton Bank. Scar- 

 borough Mere. 



S.E. — Riccall Common. 



328. Cosmarium tinctum Ralfs. 

 S.W.— Thornton Moor. CuUingworth. 



