82 YORKSHIRE NATURALISTS' UNION. 



forma Boldtii West in Journ. Roy. Micr. Soc, 1892, 

 p. 726.]. 

 S.W.— Keighley Moor. 



N.W. — Bog near Widdale Beck. Snaizeholme Fell. 

 This variety has not before been recorded for the British 

 Isles. It differs from the typical form in the rather less pro- 

 nounced undulations of the lateral margins, the faintly incised 

 apex, and the reduced protuberances of the vertical view, the 

 central area of the semi-cells being slightly thickened. 



367. Cosmarium venustum (Bn^b.) Arch., 186 1. [Syn. 

 Euastnivi venustum Brdb., 1856 ; Cosmarium cam- 

 bricum Cooke & Wille, 1880]. 



S.W.— Keighley Tarn. Old Cote Moor. 



N.AV.— Mickle Fell. 



S.E. — Riccall and Skipwith Commons. Hornsea Mere. 



368. Cosmarium ovale Ralfs. 

 N.W.— Great Shun nor Fell. 

 N.E.— Strensall. 



369. Cosmarium tetraophthalmum (KUtz.), Menegh. 

 S.W.— Ogden Clough. 



Mm W. — Bramhope (W. B. Turner). Adel Bog. Eldwick. 

 Malham Tarn. 



N.W. — Mickle and Cronkley Fells. 



N.E. — Thirkleby Park (W. B. Turner). Pilmoor, near Thirsk. 



S.E. — Riccall Common. Cleava Cliffs, north of Selby. 



Var. Lundellii Wittr. 

 N.E. — Pilmoor, near Thirsk. 

 S.E. — Sandholme. Hornsea Mere. 



370. Cosmarium eboracense West. 



Mid W. — Baildon. Cowside Beck, Arncliffe. Half-a-mile 

 south of Cray Moss. 

 N.W. —Cronkley Fell. 

 N.E. — Staindale. 



371. Cosmarium Botrytis (Bory) Menegh. 



S,AV. — Denholme. Frizinghall. Cullingworth. Near Keighley. 



Trans. Y.N.U,, 1897 (pub. Dec. 1900). got. Series, Vol. 5. 



