172 YORKSHIRE NATURALISTS* t'XION. 



S.E. — Beverley. 



850. Navicula cryptocephala Kiitz. 



S.W. — Bradford. Cullingworth. Roche Abbey (J. N. 

 Coombe ; M. H. Stiles). 



MidW. — Wigton Moor. Moiighton Fell. Baildon. Kildwick. 



N.W.— Jervaulx Abbey. Dodd Fell. 



N.E.— Carlton Bank. Saltburn. 



S.E. — Tickton. W^hen. Newsholme, near Howden. River 

 Hull ; Market ^^'eighton Canal ; Dairycoats (G. Norman). 



Var. veneta (Kiitz.) V. H. [Syn. Navicula veneta Kiitz. J. 

 S. W. — Cullingworth. 

 Mid W. — Shipley Glen. Boston Spa. 

 N.E. — Pilmoor, near Thirsk. 

 S.E. — Newsholme. Market Weighton. 



851. Navicula angustata W. Sm. 



S.W. — Doncaster. Greetland, near Halifax. Chellow Dean. 

 Bingley. N\'orth Valley, near Keighley. Thome Moor 

 (G. Norman). Crimsworth Dean. Ogden Clough. 



Mid W. — Dropping Well, Knaresborough. Moughton Fell. 

 Holden Gill, near Keighley. 



N.W. — Mickle Fell. Cautley Spout. 



N.E. — Scarborough Mere. 



S.E. — Near Meaux Abbey. Beverley. Tickton. \\'aghen. 

 Newsholme. 



852. Navicula rhynchocephala Kiitz. 



S.W. — Greetland, near Halifax. Chellow Dean. Cullingworth. 

 Doncaster town water (M. H. Stiles). Goole; Roche Abbey 

 (E. Hunter). Marley, near Bingley. 



Mid W. — Harrogate (G. Norman). Pond at Horsforth. 

 Hawksworth Springs. 



N.AV.— Reeth. 



S.E. — Loftsome Bridge, near Wressle. Beverley. Waghen. 

 Tickton. Near Meaux Abbey. Market Weighton. Cottingham ; 

 Risby Pond; Haltenprice; Market ^^'eighton Canal (G. Norman). 



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



