W. WEST AND G. S. WEST: ALGA-FLORA OP YORKSHIRE. 175 



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



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

 Beast Cliff. Staindale. Carlton Bank. 



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

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

 Cottingham (G. Norman). 

 Var. ovalis Hilse. 



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



866. Navicula pygmaea Ktitz. 



[Syn. Navicula viiiiutula W. Sm.J. 

 S.W. — Cullingworth. Cusworth near Doncaster ! (M. H. Stiles). 

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



867. Navicula mutica Kiitz. 



S.W. — Thome Moor (G. Norman). Cullingworth. 



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



roiieis crucicula ^V. Sm. ; S. dilatata W. Sm.]. 

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



869. Navicula integra W. 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 Yiorik?^. 

 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. J. 



