W. WEST AND G. S. WEST: ALGA-FI.ORA OF YORKSHIRE. l8x 



N.W.— Mickle Fell. Cronkley Fell. Bog near Widdale 

 Beck. Snaizeholme Beck. Dodd Fell. Cowgill Wold Moss, 

 AViddale Fell. 



N.E. — Carlton Bank. Saltersgate (G. Norman). 



S.E. — Beverley. Waghen. Gottingham; River Hull (G. 

 Norman). 



898. Vanheurckia vulgaris (Thw.) V.H. 



[Syn. Colletonema vulgaris Thw.]. 

 S.W. — Marley, near Bingley. 

 MidW.— Rombald's Moor. Ribblehead. 

 Hawk sworth Springs (near Shipley). 



S.E. — Market Weighton. Cottinghani (G. Norman). 

 N.E.— Carlton Bank. 



Genus AMPHIPLEURA Kiitz., 1844. 



899. Amphipleura pellucida Kiitz. 



S.W. — Near Doncaster. Askern and Hatfield districts ; 

 Roche Abbey (M. H. Stiles). Cullingworth. 



Mid W. — Roundhay (J. Abbott). Staveley Dam, near Knares- 

 borough. Shipley Glen. South of Cray Moss. 



N.W. — Jervaulx Abbey. Mickle Fell. 



N.E. — Scarborough Mere. Pilmoor, near Thirsk. Ingleby 

 Greenhow. 



S.E. — Skipwith Common (Rev. W. Fowler!). Cottingham ; 

 Risby Pond ; Botanic Gardens, Hull (G. Norman). 



Genus SCOLIOPLEURA Grun., i860. 



900. Scoliopleura Westii (AV. Sm.) Grun. 



[Syn. Navicula Westii \Y. Sm.]. 

 S.E. — In brackish water. River Hull (G. Norman). 



Genus PLEUROSIGMA W. Sm., 1853. 



901. Pleurosigma attenuatum (Kii.tz.) W. Sm. 



S.W. — Askern, Cusworth, and Hatfield districts ; Doncaster 

 town water ; Firsby Reservoirs (M. H. Stiles). Bradford. Mar- 

 ley, near Bingley. Goole ; Roche Abbey (E. Hunter ; M. H. 

 Stiles ; J. N. Coombe). 



Pot. 5-L 



