120 YORKSHIRE NATURALISTS' UNION. 



Mid VV. — Bramhope (J. Abbott). Arthington. Langcliffe, 

 near Settle. 



N.W.— Mickle Fell. Near Jervaulx Abbey. 



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

 Wyke. 



575. Scenedesmus quadricauda (Turp.) Breb. 



S.W. — Doncaster. Skelmanthorpe. Wibsey. Bradford. 

 Frizinghall. 



Mid \V, — Markington ! (Rev. J. S. Tute). Bramhope (J. 

 Abbott). Baildon. Arthington. Boston Spa. Oak Beck, Harro- 

 gate. Ilkley. Ben Rhydding. Roundhay Park, Leeds. ATalliam 

 Tarn. Ribblehead. 



N.W. — Mickle Fell. Near Jervaulx Abbey. 



N.E.-- Near Rievaulx Abbey. Strensall ! (W. B. Turner). 

 Terrington. Pilmoor, near Thirsk. Stokesley. Scarborough 

 Mere. Saltburn. 



S.E. — Skipwith Common. Loftsome Bridge, near Wressle. 

 Market Weighton. Hornsea Mere. 

 Var. abundans Kirch n. 



Mid W.— Bolton Woods. 



N.E.— Scalby Beck. 



576. Scenedesmus denticulatus Lagerh. 

 S.W— Near Bradford. 



Var. linearis Hansg. 



S.W.— Askern. 



Mid W. — Roundhay Park, Leeds. Boston Spa. Staveley 

 Dam, near Knaresborough. Wigton Moor. Penyghent. 



N.E. — Pilmoor, near Thirsk. Terrington. River Derwent, 

 Forge Valley. 



vS.E.— Skipwith Common. Market Weighton. 



577. Scenedesmus spicatus West &(J. S. West. 

 N.E.— Saltburn. 



Cells generally binate, elliptical, about twice longer than 

 broad, each furnished with a series of six or seven short spines 

 on the exterior margin. 



Trans. Y.N.U., 1899 fpiili. July igoi). Bot. Series, Vol. 5. 



