2l8 VOUKSHIkE naturalists' UNION. 



S.AV. — Oil wet rocks near Bingley. 



S.E. — Hornsea Peat Deposit (G. Norman). 



1034. Melosira Jurgensii Ag. 



[Syn. J/, snhfiexills Kiitz.]. 

 S.E. — Brackish water ditch running from Stoneferry to Sutton 

 (pure) (G. Norman). 



Genus CVCLOTELLA Kutz., 1833. 



1035- Cyclotella comta (Ehrenb.), Kiitz. 

 S.W. — Doncaster town water (M. H. Stiles). 



1036. Cyclotella operculata Kutz. 



S.W. — Cusworth district ; Doncaster town water (M. H. 

 Stiles). Goole (E. Hunter). Near Bradford. 



Mid W.— Ripley (G. Norman). Roundhay (J. Abbott). 

 Staveley Dam, near Knaresborough. Moughton Fell. Arthington. 



S.E. — Spring Ditch ; Cottingham (G. Norman). Loftsome 

 Bridge, near Wressle. Skipwith Common. 



1037. Cyclotella Meneghiniana Kiitz. 

 Mid W.~Baildon. 



N.E. — Carlton Bank. 



1038. Cyclotella minutula Kiitz. 

 S.E. — Hornsea Peat Deposit (G. Norman). 



1039. Cyclotella Ktitzingiana Chauvin. 



S.W. — Askern, Cusworth, and Hatfield districts (M. H. Stiles). 

 Roche Abbey (J. N. Coombe ; M. H. Stiles). Doncaster. Cul- 

 lingworth. 



N.E. — Near Scarborough, abundant (vi. 1896). Carlton Bank. 



S.E. — Spring Ditch; Cottingham; Stoneferry; INIarket Weigh- 

 ton Canal; Wawne (G. Norman). 



1040. Cyclotella Astrsea (Ehrenb.) Kiitz. 



[Syn. C. rotula Kiitz.]. 

 S.E. — Market Weighton Canal; Hornsea Peat Deposit (G. 

 Norman). 



Trans Y.N.U., 1901 (puU. July lyoi). Dot. Series, Vol. 5. 



