W. WEST AND U. S. WEST : ALGA-FLORA OF YORKSHIRE. 205 



N.W.— Sedbergli. Baiigh Fell. Whernside. Mickle and 

 Cronkley Fells. Great Shunnor Fell. Hawes. 



N.E. — Pilmoor, near Thirsk. Saltersgate (G. Norman). 

 Scarborough. 



S.E. — Riccall Common. Cottingham; Spring Head; Spring 

 Ditch; Risby Pond (G. Norman). 



Var. ventricosa (Kiitz.) Rabenh. 



S.W.— Cullingworth. 



Mid W. — Wigton Moor. Rombald's Moor. Baildon. Adel 

 Dam.. 



N.W.— Leeming. Mickle Fell. Great Shunnor Fell. 



N.E. — Scarborough Mere. 



Genus TETRACYCLUS Ralfs, 1843. 



980. Tetracyclus rupestris (A. Br.) Grun, 



[Syn. Gomphogramma rupestris A. Br. ]. 

 S.W. — Goole (J. Harrison). 



98 1. Tetracyclus lacustris Ralfs. 

 Mid W.— Roundhay (W. B. Turner). 



Family SURIRELLE.E. 

 Genus CYMATOPLEURA W. Sm., 1851. 



982. Cymatopleura elliptica (Breb.) W. Sm. 



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

 (M. H. Stiles). Goole; Roche Abbey (E. Hunter). Heaton. 

 Cullingworth. Fixby. 



Mid W.— Roundhay; South Milford (W. B. Turner). Hawks- 

 worth. Baildon. Malham Tarn Bog. Bolton Woods. Near 

 Settle. Staveley Dam, near Knaresborough. 



N.W.— Cronkley Fell. Dodd Fell. 



N.E. — Levisham. 



S.E. — Routh; Risby Pond; Wawne; Haltenprice; Hornsea 

 Deposit ; Cottingham ; Spring Ditch ; Beverley ; Market 

 Weighton Canal (G. Norman). 

 Var. constricta Grun. 



S.W.— Goole. 



