162 YORKSHIRE NATURALISTS UNION. 



Mid W.— Baildon. South Milford (W. B. Turner). Staveley 

 Dam, near Knaresborough. 



N.W.— Rokeby. 



N.E. — Rievaulx Abbey. Carlton Bank. Stokesley. 



S.E. — Beverley. Spring Ditch ; Haltenprice; Cottingham; 

 Newbald ; Risby Pond ; Hornsea Peat Deposit ; Wawne ; 

 Reservoir Waterworks, Hull (G. Norman). 



Var. scalprum (tiaill.) Grun. 

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



902. Pleurosigma acuminatum (Kiitz.) Grun. 



[Syn. Pleurosigma lacustre W. Sm,]. 



S.W.— Bradford. Chellow Dean. Askern (M. H. Stiles; 

 F. H. Allen). Roche Abbey (E. Hunter; M. H. Stiles; J. N. 

 Coombe). Doncaster. 



Mid W. — Baildon. Malham Tarn. Harrogate (G. Norman). 

 Roundhay (W. B. Turner). Adel. Arthington. Horsforth. 

 Ripley (G. Norman). Boston Spa. Hawksworth Springs. 



N.E. — Seamer. Scarborough Mere. Cornelian Bay. Salt- 

 burn. 



S.E. — Hornsea Mere. Tickton. Beverley ! Waghen. Loft- 

 some Bridge, near Wressle. Newsholme. Skipwith Common. 

 Cottingham ; River Hull ; Risby Pond ; Market Weighton ; 

 Haltenprjce ; Hornsea Peat Deposit (G. Norman). 



903. Pleurosigma Spencerii (Quekett) W. Sm. ^^ 

 S.W. — Cus worth and Hatfield districts ; Firsby Reservoirs 



(M. H. Stiles). Roche Abbey (J. Newton Coombe). Goole 

 (E. Hunter). Doncaster. Fixby. Bradford. 



Mid W.— South Milford (W. B. Turner). Leathley. 



N.W.— Mickle Fell. Reeth. 



N.E. — Seamer.. Strensall. Hayburn Wyke. River Derwent, 

 Forge Valley. Saltburn. Carlton Bank. 



S.E. — Beverley. Routh. Skipwith Common. Market Weigh- 

 ton. Spring Ditch ; Hornsea Mere ; Wawne ; Risby Pond ; 

 Hornsea Peat Deposit ; Haltenprice (G. Norman). 



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



