158 YORKSHIRE NATURALISTS* UNIOI*. 



Forma major West. 

 N.W.— Cronkley Fell. 



795. Chroococcus pallidus Nag. 



Mid W. — On dripping rocks, Shipley Glen (iv, 1895). Near 

 Buckden. Old Cote Moor. Helln Pot, near Selside. Linn Gill. 

 N.W.— Mossdale Moor, Widdale Fell. Lund's Fell. 



796. Chroococcus rufescens (Breb.) Nag. 



Mid W. — Holden Gill, near Keighley. Cowside Beck, Arn- 

 cliffe. 



N.E. — Pilmoor, near Thirsk. 



797. Chroococcus schizodermaticus West. 

 S.W. — On wet rocks, near Bingley. 



Mid W. — Boston Spa. Linn Gill. 

 N.W. — Cautley Spout, very fine. 



Var. badio-purpureus West & G. S. West. 

 Mid W.— Helln Pot, near Selside. 



BACILLARIEiE. 



Order RAPHIDIE^. 



Family CYMBELLEjE. 



Genus AMPHORA Ehrenb., 1831. 



798. Amphora ovalis KUtz. 



S.W. — Roche Abbey (E. Hunter). Marley, near Bingley. 

 CuUingworth. Near Keighley. Doncaster. Askern, Cusworth 

 and Hatfield districts ; Firsby reservoir ; Roche Abbey ; Rossing- 

 ton (M. H. Stiles). 



Mid W. — South Milford (W. B. Turner). Baildon. 

 Moughton Fell. Malham Cove (J. M. Kirk). Malham Tarn. 

 Kilnsey. Otley. Boston Spa. Ingleton. 



N.W. — Cotterdale. Jervaulx Abbey. 



N.E. — Seamer. Scarborough Mere. Whitby. Staindale. 

 Cornelian Bay. Saltburn. 



S.E. — Routh. Beverley. Tickton. Loftsome Bridge, near 

 Wressle. Market Weighton. 



Trans. Y.N.U., 1S99 (pub. July 1901). Bot. Series, Vol. 5. 



