W. WEST AND G. S. WEST; ALGA-FLORA OF YORKSHIRE. 1 79 



N.W.— Mickle Fell. 



N.E.— Seamer. Strensall (W. B. Turner). 



S.E. — Beverley. Cottingham ; Skirlaugh (G. Norman). 



Var. affinis (Ehrenb.). V. H. 



[Syn. Navicula affinis Ehrenb.]. 

 S.W.— Goole (J. Harrison). Roche Abbey (M. H.. Stiles; 

 J. N. Coombe). Chellovv Dean. Bradford. CuUingworth. 

 Keighley Moor. 



Mid W. — Add Bog. Roinbald's Moor. Holden Gill, near 

 Keighley. Moughton Fell. 



N.E. — ' Common.' Cornelian Bay. Saltburn. Carlton Bank. 

 S.E. — Market Weighton. Spring Ditch ; Cottingham 

 (G. Norman). 



Var. producta (W. Sm.) V. H. 



[Syn. Navicula producta W. Sm.]. 

 S.W.— Roche Abbey (M. H. Stiles ; J. N. Coombe). 

 Mid W. — Boston Spa. 



N.E. — Marske. Strensall. Pilmoor, near Thirsk. 

 S.E. — Loftsome "Bridge, near Wressle. Skirlaugh ; Cotting- 

 ham ; Haltenprice ; Hornsea Peat deposit (G. Norman). 



891. Navicula bacillum Ehrenb. 



[Syn. N. bacillaris Greg.]. 

 S.E. — Hornsea Peat deposit ; Cottingham (G. Norman). 



892.— Navicula laevissima (Kiitz. ?) Grun. 

 N.E. — Saltersgate (G. Norman). 



S.E.— Cottingham ; Hornsea Peat deposit; Haltenprice; 

 Wawne (G. Norman). 



893. Navicula Pupula Kiitz. 

 S.W. — Ogden Clough. Near Bingley. 



Mid W.— Baildon. Harrogate. Linn Gill. Hawksworth 

 Springs. Moughton Fell. 

 S.E.— Wressle. 



894. Navicula binodis (Ehrenb.) VV. Sm. 



Mid W,— Baildon. Hawksworth Springs. Rombald's Moor, 



