176 YORKSHIRE NATURALISTS' UNION. 



Mid W. — Hawksworth Springs, near Shipley. 



.N.E.— Whitby. 



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

 ^Vaghen. Near Stoneferry ; Wawne ; Market Weighton Canal ; 

 Cottingham (G. Norman). 



877. Navicula Trochus Ehrenb. 



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

 Grove). 



878. Navicula cuspidata Kiitz. 



S.W. — Askern, Cusworth, and Hatfield districts; Firsby reser- 

 voirs ; Rossington (M. H. Stiles). Hatfield Chase (J. M. Kirk). 

 RocheAbbey (E. Hunter; M. H. Stiles; J. N. Coombe). Elslack. 



Mid W. — Roundhay ; South Milford ; Blubberhouses (W. B. 

 Turner). Harrogate (G. Norman). Baildon. Moughton Fell. 

 Pond at Pool. Pond at Horsforth. Boston Spa. 



N.W.— Great Shunnor Fell. 



N.E. — Scarborough Mere. Carlton Bank. Seamer. Malton. 



S.E. — Riccall Common. Skipwith Common. Market Weigh- 

 ton. Loftsome Bridge, near Wressle. Wressle. Cottingham ; 

 Hornsea Mere and Hornsea Peat Deposit ; Risby Pond; Spring 

 Ditch ; Stepney ; Haltenprice (G. Norman). 



879. Navicula ambigua Ehrenb. 



S.W. — Rossington ; Firsby Reservoirs (M. H. Stiles). 

 N.E.— Strensall. 



S.E. — Market Weighton. Wressle. Stoneferry; Hornsea 

 Peat Deposit (G. Norman). 



880. Navicula sculpta Ehrenb. 

 S.\\'.— Askern district (M. H. Stiles). 



881. Navicula sphaerophora Kiitz. 

 S. W. — Doncaster. 



S.E. — Near Meaux Abbey. Beverley. ^Vressle. Haltenprice; 

 Hornsea Peat Deposit (G. Norman). 



882. Navicula sedans (Brdb.) Kiitz. 



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



Trans. Y.N.U., igoi (pub. July 1901). Bol. Series, Vol. 5. 



