W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 73 



322. Cosmarium undulatum Corda. 

 S.W. — Rawcliffe Common. CuUingworth. 



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

 lam. 



N.W.— Mickle Fell. 



N.E.— Strensall. 



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



Var. minutum AVittr. 

 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 /x ; breadth, 

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

 breadth of zygospore, lo/x. 



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 W.— Cowgill Wold Moss, Widdale Fell. 

 Previously unrecorded for the British Isles. 



327. Cosmarium bioculatum Breb. 



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

 Allerton, near Bradford. CuUingworth. 



Mid W. — Adel Bog. 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. 



