W. WEST AND G. S. WEST: ALGA-FLORA OP YORKSHIRE. 1 75 



N.W.— Sedbergh. Micklc Fell. Dodd Fell. 



N.E. — Seamer. Moist ground, Whitenab, Scarborough. 

 Beast Cliff. Staindale. Carlton Bank. 



S.E. — Market Weighton. Hornsea Peat deposit ; Halten- 

 price ; River Hull and Reservoir AVaterworks, Hull ; Newbald ; 

 Cottingham (G. Norman). 

 Var. ovalis Hilse. 



S.W. — Cusworth district; Doncaster town water (M. H. Stiles). 



866. Navicula pygmaea Kiitz. 



[Syn. Navicula miitutula W. Sm.J. 

 S.W. — CuUingworth. Cusworth near Doncaster I (M. H. Stiles). 

 S.E. — Stoneferry ; ditch near River Hull (G. Norman). 



867. Navicula mutica Kiitz. 



S.W, — Thorne Moor (G. Norman). CuUingworth. 



868. Navicula crucicula (W. Sm.) V. H. [Syn. Stau- 



roneis crucicula AV. Sm. ; S. dilatata W. Sm.]. 

 S.E. — Ditch near River Hull ; in brackish water (G. Norman). 



869. Navicula Integra AV. Sm. 

 Mid W. — Hawksworth Springs. 



870. Navicula scita W. Sm. 



S.E. — Newbald ; Cottingham (G. Norman). 



871. Navicula elegans W. Sm. 

 S.E. — Near Stoneferry (G. Norman). 



872. Navicula latissima Greg. 

 S.W.— Roche Abbey (E. Hunter). 



873. Navicula granulata Breb. MS. Var. maculosa 



(Donk.) V. H. [Syn. Navicula maculosa Donk.]. 

 S.W.— Rossington (M. H. Stiles). 



874. Navicula tumens W. Sm. 

 S.E. — Near Stoneferry (G. Norman). 



875. Navicula lepida Greg. 



S.E. — Very rare in fresh water, Spring Ditch (G. Norman). 



876. Navicula pusilla W. Sm. 



[Syn. Navicula gastroides Greg.]. 



