\V. WEST AND G. S. WItST : ALGA-FLORA OF YORKSHIRE. I15 



S.W. — More or less general in stagnant rain-water. Wibsey. 

 Manningham. Keighley Moor. 



Mid W.— Baildon. Leeds (J. Abbott). Harrogate (T. Hick). 

 Boston Spa. 



N.W.— Cotterdale. 



N.E. — Strensall ! {W. B. Turner). Seamer. Scarborough 

 Mere. 



S.E. — Beverley. 



Family PALMELLACEyE. 



Sub-Family Ccenobie^f:. 



Genus HYDRODICTVON Roth., 1800. 



548. Hydrodictyon reticulatum (L.), Lagerh. [Syn. 



CoTiferva reticulata L. ; Hydrodictyon ittriculatiDii 

 Roth.]. 



N.E. — Scarborough Mere! (G. Massee). 



Genus CCFXASTRUAr Nag., 1849. 



549. CcElastrum sphsericum Nag. 



S.W.— Keighley Moor. 



Mid W. — Penyghent. 



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



S.E. — Riccall and Skipwith Commons. 



550. Ccelastrum microporum Nag. 

 Mid W.— Adel. Malham Tarn. 



N.E. — Scarborough Mere. 

 S.E. — Riccall Common. 



551. Ccelastrum pulchrum Schmidle. 



Mid U'. — Roundhay Park, Leeds. Staveley Dam, near 

 Knaresborough. 



N.E.- — Pilmoor, near Thirsk. 



552. Ccelastrum cubicum Nag. 



N.E. — Pilmoor, near Thirsk. 



553. Ccelastrum verrucosum Reinsch. 

 N.E. — Pilmoor, near Thirsk. 



