200 YORKSHIRE NATURALISTS' UNION. 



ghent. Holden Gill, near Keighley. Wigton Moor. Moughton 

 Fell. 



N.W.— Mickle Fell. Romaldkirk. 



N.E.— Strensall. 



Family FRAGILARIE.^. 

 Genus FRAGILARIA Lyngb., 1819. 



966. Fragilaria virescens Ralfs. 



S.W. — Not uncommon about Bradford. Marley, near Bingley. 

 Mid AV. — Havvksworth Springs (H. F. Parsons). Bowland 

 Knotts. 



N.E. — Terrington. 



S.E. — Cottingham ; Wawne ; Inglemire Lane (G. Norman). 



967. Fragilaria capucina Desmaz. 



S.W. — Cusworth and Hatfield districts ; Rossington (M. H. 

 Stiles). Askern (J. M. Kirk ; M. H. Stiles). Hatfield Chase 

 (J. M. Kirk). Roche Abbey (J. N. Coombe; M. H. Stiles). Brad- 

 ford. CuUingworth. Doncaster. Bingley. Denholme. Oxen- 

 hope. Worth Valley and Keighley Tarn. 



Mid W. — Chapeltown ; Roundhay (W. B. Turner). Malham 

 Cove (J. M. Kirk). Adel Bog. Holden Gill, near Keighley. 

 Whernside. Arthington. Ilkley. 



N.W.— Sedbergh. Mickle Fell. 



N.E. — Lockton. Egton. Strensall. Scarborough Mere. 

 Terrington. Malton. Stokesley. 



S.E. — Tickton. Near Meaux Abbey. Newsholme. Beverley. 

 Loftsome Bridge, near Wressle. Hull ; Cottingham ; Inglemire 

 Lane (G. Norman). 



Var. mesolepta Rabenh. 

 S.W. — Firsby reservoirs (M. H. Stiles). 

 Mid W^ — Cocket Moss, near Giggleswick. 

 N.E.— Lockton. 



968. Fragilaria construens (Ehrenb.) Grun. 



[Syn. Odontidwm Tabellaria W. Sm.]. 



Trans, Y.N.U,, igoi (pub. July iqot). Rot, Series, Vol. 5. 



