214 YORKSHIRE NATURALISTS' UNION. 



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



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

 Cullingworth. 



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



N.E. — Rievaulx Abbey. 



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

 AVaghen. 



1014. Nitzschia fasciculata Grun. 

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



1015. Nitzschia obtusa W. Sm. 

 Var. scalpelliformis Grun. 



S.E. — l>oftsome Bridge, near Wressle. 



Var. nana Grun. 

 j\IiD W. — Hawksworth Springs. 

 S.E. — Skipwith Common. 



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



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

 VVoolley. 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. tenuisW. Sm.]. 



S.W. — Bradford. Chellow Dean. Allerton. 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. Market Weighton. Haltenprice ; 

 Spring Ditch ; Cottingham (G. Norman). 



1017. Nitzschia vitrea Norman. 



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



Trans, V.X.U., igoi (pub. July igoi). Eot. Series, Vol. 5. 



