\V. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. I 73 



853. Navicula Dirhyncus Ehrenb. 

 S.W.— Moiley. 



Mid W. — Adel Bog. Alalhani Tarn. 

 S.E. — Near Sutton. Routli. Beverley. 

 S54. Navicula humilis Uonk. 



[Syn. Navicula inflata W. Sm., non Kiitz.]. 

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

 CuUingworth. Roche Abbey (J. N. Coombe). 



Mid W. — Hawksworth Springs. Holden Gill, near Keighley. 

 Boston Spa. Killinghall (G. Norman). Kildwick. 

 N.W.— Mickle Fell. 

 N.E.— Saltburn. Carlton Bank. 



S.E. — Waghen. Tickton. Beverley. Wawne ; Market 

 Weighton Canal ; Beverley Parks ; Cottingham (G. Norman). 



855. Navicula nana Greg. 



[Syn. Pinnularia pygiiKza Ehrenb.]. 

 S.E. — River Hull; Cottingham ; near Stoneferry (G. Norman). 



856. Navicula digitato-radiata Greg. 

 Var. Cyprinus (W. Sm.) V.H. 



[Syn. Navicula Cyprinus A^^ Sm.]. 

 S.E. — Dairycoats ; ditch near River Hull (G. Norman). 

 857. Navicula Reinhardtii Grun. 

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



Mid W. — In River Skell, Fountains Abbey (G. Stuart ; E. 

 Grove). Ribblehead. 



858. Navicula lanceolata Kiitz. 

 S.W.— Cusworth District (M. H. Stiles). Bradford. CuUing- 

 worth. 



Mid W. — Kildwick. 



S.E. — Beverley Parks, near ^Voodmancy (G. Norman). 



85Q. Navicula Gastrum (Ehrenb.) Donk. 

 Mid W. — Cocket Moss, near Giggleswick. 

 860. Navicula tumida W. Sm., 1853. 



[Syn. Navicula atiglica Ralfs, 1861]. 



