178 YORKSHIRE NATURALISTS' UNION. 



Mid W. — Cocket Moss, near Giggleswick, Hawksworth 

 Springs. Ingleton. 



N.W. — Mickle and Cronkley Fells. 



N.E.— Carlton Bank. 



S.E. — Beverley. Market Weighton. River Hull near 

 Wawne ; Cottingham (G. Norman ). 



Van gibberula (Kiitz.) V.H. [Syn. N. gibbenda Kiitz. ]. 



S.W. — Marley, near Bingley. Roche Abbey (J. N. Coombe). 



Mid W. — Baildon. Eldwick. 



N.W.— Mickle Fell. 



N.E.— Staindale. Hayburn Wyke. 



S.E. — Risby Pond ; Skirlaugh ; Cottingham ; Hornsea Mere 

 and Peat deposit ; near Stoneferry ; Wawne ; Haltenprice ; 

 Spring Ditch ; Market Weighton Canal (G. Norman). 



889. Navicula ventricosa (Ehrenb. ? ) Donkin. 

 Mid W. — Baildon. 



890. Navicula I ridis Ehrenb. [Syn. iV. /r/«rt W. Sm.j. 

 S.W.— Askern district and Roche Abbey (M. H. Stiles). 

 Mid W. — Bog two miles south of Clapham. 



S.E. — Risby Pond; Cottingham; Haltenprice; Spring Ditch 

 (G. Norman). 



Var. Amphigomphus (Ehrenb.) V. H. 



[Syn. Navicula Amphigotnplms Ehrenb.]. 

 S.W.— Shipley. 



Mid W. — Harrogate (G. Norman). Langcliffe near Settle, 

 Bog two miles south of Clapham. 

 N.E. — Near Scarborough. 



S. E. — Skipwith Common. Cottingham ; Wawne (G. Norman). 

 Var. Amphirhyncus (Ehrenb.) De Toni. 



[Syn. Navicula Amphirhyncus Ehrenb.]. 

 S.W. — Hatfield district ; Rossington (M. H. Stiles). Goole; 

 Roche Abbey (E. Hunter). CuUingworth. 



Mid W. — Roundhay (Abbott, Emsley, and Turner). Harro- 

 gate (G. Norman). Adel Bog. Eldwick. Ilkley. Hawks- 

 worth Springs. Malham Tarn. Bowland Knotts. 



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



