214 YORKSHIRE NATURALISTS' UNION. 



1013. Nitzschia curvula (Ehrenb.)W. Sm. 



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

 Cullingworth. 



Mid W, — Adel Bog. Cocket Moss, near Giggleswick. 



N.E. — Rievaulx Abbey. 



S.E.— Stoneferry to Sutton (R. Harrison). Routh. Beverley. 

 Waghen. 



1014. Nitzschia fasciculata Grun. 

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



1 01 5. Nitzschia obtusa W. Sm. 

 Var. scalpelliformis Grun. 



S.E. — Eoftsome Bridge, near Wressle. 



Var. nana Grun. 

 Mid W. — Hawksworth Springs, 

 S.E. — Skipwith Common. 



1016. Nitzschia linearis (Ag.) W. Sm. 



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

 WooUey. Denholme. Farnley. Shipley. Frizinghall. 



Mid W.— Holden Gill, near Keighley. Gordale. Above Eld- 

 wick. Boston Spa. Cray Moss. Baildon. 



N.W.— Jervaulx Abbey. Mickle Fell. 



N.E. — Hayburn Wyke. Saltburn. 



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

 Haltenprice ; Cottingham (G. Norman). 



Var. tenuis (W. Sm.) Grun. [Syn. N. temds\\\ Sm.]. 



S.W. — Bradford. Chellow Dean. AUerton. Doncaster. Cragg 

 Vale, towards Blackstone Edge. 



Mid W. — Moughton Fell. Gordale. Pond at Pool. 



N.E. —Rievaulx Abbey. Malton. 



S.E. — Beverley. Newsholme. Loftsome Bridge, near 

 Wressle. Tickton. Routh. Marke.t Weighton. Haltenprice ; 

 Spring Ditch ; Cottingham (G. Norman). 



10 1 7. Nitzschia vitrea Norman. 



S.E. — Near Stoneferry in brackish ditch (G. Norman). 



Trans, ^'.N.U•, 1901 (pub. July 1901). Hot. Series, Vol. 5. 



