174 YORKSHIRE NATURALISTS UNION. 



S.W.— Roche Abbey (M. H. Stiles). 

 Mid ^^■. — Shipley. Hawksworth Springs. 

 N.W.— Reeth. 

 N.E. — Seanier. Saltburn. 



S.E. — Loftsome Bridge, near ^^'ressle. Cottingham (G. Nor- 

 man). 



86 1. Navicula Semen Ehrenb. 

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



S.E.— Cottingham ; Hornsea Peat deposit ; Risby Pond 

 (G. Norman). 



862. Navicula dicephala Ehrenb. 



S.W. — Doncaster town water (M. H. Stiles). Halifax. 

 Allerton. Marley, near Bingley. Ogden Clough. CraggVale, 

 towards Blackstone Edge. 



Mid W. — ^Whernside. Malham Tarn Bog. Bowland Knotts. 

 Hawksworth Springs. Near Buckden. Kildwick. 



N.W.— Mickle Fell. Great Shunnor Fell. Dodd Fell (in 

 great abundance in stream at 1500 ft.). Muker. Bog near 

 Widdale Beck. Snaizeholme Beck. 



N.E.— Goathland. 



S.E. — Near Meaux Abbey. Beverley. Routh. Waghen. 

 Tickton. Cottingham ; Haltenprice (G. Norman). 



863. Navicula gracillima Ralfs. 



[Syn. Pinnularia gracillima Greg.]. 

 N.E. — Rocky stream, Saltersgate (G. Norman). 



864. Navicula Smithii Breb. 

 S.E.— Ditch near River Hull (G. Norman). 



865. Navicula elliptica Kiitz. [Syn. N. ova lis VV. Sm.]. 

 S.W.— Chellow Dean. Marley, near Bingley. CuUingworth. 



Roche Abbey (M. H. Stiles ; J. N. Coombe). Ogden Clough. 

 Askern, Cusworth and Hatfield districts ; Firsby reservoirs 

 (M. H. Stiles). 



Mid W. — Baildon. Penyghent. Near Buckden. South of 

 Cray Moss. Moughton Fell. Markington (Rev. J. S. Tute ! ). 



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



