196 YORKSHIRE NATURALISTS' UNION. 



Genus CERATONEIS Ehrenb., 1840. 



955. Ceratoneis Arcus (Ehrenb.) Kiltz. 



[Syn. Eunotia Arcus (Ehrenb.) W. Sm.]. 



Mid W. — ^Miernside. Holden Gill, near Keighley. Simon 

 Seat. 



N.W.— Calf Beck, Howgill Fells. Cautley Spout. Great 

 Shunnor Fell. Muker. Hunter's Hole, Craydale Moor 

 (1900 ft.). Mickle Fell, Cowgill Wold Moss, Widdale Fell. 



Var. Amphioxys (Rabenh.) De Toni. 



[Syn. Cerafone/s Amphioxys Rabenh.]. 

 Mid W. — AVhernside. Leathley. Holden Gill, near Keighley, 

 Harrogate. Oak Beck. 



N.W.— Calf Beck, Howgill Fells. Lund's Fell. 



Family SYNEDRE^. 

 Genus SYNEDRA Ehrenb., 1831. 



956. Synedra pulchella Kiitz. 



S.W. — Doncaster town water ; Firsby reservoirs ; Hatfield 

 district (M. H. Stiles). Bingley. Liversedge (Rev. W. Fowler!). 

 Keighley. Shipley. Farnley. 



Mid W.— Baildon. Whernside. Arthington. Otley. Kilnsey. 

 Boston Spa. Harrogate. Ribblehead. 



N.W.— Mickle Fell. River Ure. 



N.E. — Hayburn Wyke. Rievaulx Abbey. Ingleby Greenhow. 

 Malton. 



S.E.— Tickton. Loftsome Bridge, near Wressle. Riccall 

 Common. Reservoir Waterworks, Hull (G. Norman). 



Var. acicularis (W. Sm.). [Syn. Synedra acicularis W. Sm. ; 

 S. Smithii Ralfs; S. pulchella var. Smithii (Ralfs) 

 V.H.]. 

 S.W.— Mirfield. 



Var. minutissima (W. Sm.). [Syn. Synedra minutissima 

 W. Sm.; S. pulchella var. lanceolata O'Meara], 

 Mid W, — Buckden. 



Trans. Y.N.U., 1899 (pub. July 1901). Bot. Series, Vol. 5. 



