W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 1 83 



904. Pleurosigma scalproides Rabenh. 

 S.W.— Hatfield district (M. H. Stiles). 



Mid W. — Amongst Cladophora glomerata in stream, Ingleton. 

 Genus AMPHIPR0R4 (Ehrenb.) Cleve, 1891. 



905. Amphiprora alata Kiitz. 

 S.E. — Near Stoneferry (G. Norman). 



906. Amphiprora paludosa W. Sm. 



S.E. — Stoneferry to Sutton ; ditch, near River Hull ; Anlaby 

 Road to Hessle Road (G. Norman). 



907. Amphiprora constricta Ehrenb. 



S.E.— Dairycoates ; pure near Marfleet (G. Norman). 



Family GOMPHONEMEJi. 

 Genus GOMPHONEMA Ag., 1824. 



908. Gomphonema geminatum (Lyngb.) Ag. 

 S.W.— Askern district (M. H. Stiles), 



Mid W. — Roundhay (W. B. Turner). Leathley. Moughton 

 Fell. Ribblehead. Bolton Woods. Buckden. Oughtershaw 

 Moss. 



N,W. — Cautley Spout, Upper Teesdale. Dodd Fell, water- 

 fall in Gill. 



N.E.— Strensall (W. B. Turner). 



909. Gomphonema constrictum Ehrenb. 



S,W,— Askern and Hatfield districts ; Doncaster (!) town 

 water; Rossington ; Firsby Reservoirs (M. H. Stiles). Roche 

 Abbey (M, H. Stiles ; J. N. Coombe). WooUey. Heaton. 



Mid W. — Harrogate 1 (G. Norman). Holden Gill, near 

 Keighley. Shipley Glen. Adel. Boston Spa. Staveley Dam, 

 near Knaresborough. Linn Gill. Buckden. 



N.W. — Jervaulx Abbey. Sedbergh. 



N.E, — Whitby, Staithes. Scarborough Mere. Scalby Beck. 

 Malton. 



S.E. — Loftsome Bridge, near Wressle. Newsholme. Wawne ; 

 Cottingham ; Hornsea Peat deposit \ Market Weighton Canal 

 (G. Norman). 



