W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 1 63 



N.W. — Cautley Spout. Rombaldkirk. Rokeby. 

 N.E. — Rievaulx Abbey. Malton. 



S.E.— Tickton. Routh. Beverley. Wawne; Hull (G.Nor- 

 man). 



816. Encyonema ventricosum (Ag.) Kiitz. 



[Syn. Cyt7ibella ventricosa Ag,]. 

 S.W.— Coley, near Shelf. 



Mid W. — Ingleton ! (H. F. Parsons); with sporangial valves, 

 ix. 1898. Roundhay (W. B. Turner). Baildon. Ingleborough. 

 Rombald's Moor. Ribblehead. Boston Spa. Harrogate. 

 Moughton Fell. 



N.W.— Dodd Fell. Mickle Fell. 



S.E. — Routh. Near Sutton. Beverley. Skirlaugh ; near 

 Cottingham ; Benningholme (G. Norman). 



817. Encyonema gracile Rabenh. 



S.W. — CuUingworth. Cragg Vale, towards Blackstone Edge. 

 .Mid W. — Wigton Moor. Kilnsey. Cocket Moss, near 

 Giggleswick. 



S.E. — Skipwith Common. 



Var. Scotica (W. Sm.) Van Heurck. 



[Syn. Cy?nbella Scotica W. Sm.]. 

 N.E. — Saltersgate (G. Norman). 

 S.E. — Cottingham (G. Norman). 



Family NAVICULE^. 

 Genus MASTOGLOIA Thw., 1848. 



818. Mastogloia Smithii Thw. 

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

 Mid W. — Baildon, vii. 1893. 



S.E. — Near Stone Ferry (G. Norman). 



819. Mastogloia Dansei Ihw. 



S.E. — Outlet, Hornsea Mere (G. Norman). 



Genus STAURONEIS Ehrenb., 1843. 



820. Stauroneis Phoenicenteron (Nitzsch) Ehrenb. 

 S.W. — Bradford. Keighley Tarn. Askern, Cusworth, and 



Hatfield districts (M. H. Stiles). 



