2i6 YORKSHIRE NATURALISTS' UNION. 



1022. Nitzschia longissima (Br^b.) Ralfs. 

 Var. Closterium (W. Sm.) V.H. 



[Syn. N. Closterium W. Sm.]. 

 S.E.— Beverley. 



Var. reversa (W. Sm.) V.H. [Syn. N. reversa W. Sm.]. 

 S.E.— Ditch near Stoneferry (G. Norman). 



1023. Nitzschia Smithii Ralfs. [Syn. N. spectabilis 



W. Sra. non N. spectabilis (Ehrenb.) Ralfs]. 

 S.E. — Rare in a brackish ditch near Stoneferry (G. Norman). 



1024. Nitzschia acicularis (Ktitz.) W. Sm. 



[Syn. Nitzschiella acicularis Rabenh.]. 



S.W.— Hatfield district (M. H. Stiles). Mirfield. 



MidW. — Austwick. Adel Bog. Pond at Pool. Hawksworth. 

 Bolton Woods. Boston Spa. 



N.W.— Mickle Fell. Dalton. 



N.E. — Whitby. Seamer. Scalby Beck. Saltburn. Carlton 

 Bank. 



S.E. — Routh. Near Sutton. Beverley. Loftsome Bridge, 

 near Wressle. Newsholme. Dairycoats; Cottingham (G. 

 Norman). 



1025. Nitzschia gracilis (Brdb.). 



[Syn. Nitzschiella gracilis (Breb.) Rabenh.]. 

 Mid W.— Roundhay (W. B. Turner). 

 S.E.— Waghen. 



Genus CYLINDROTHECA Rabenh., 1859. 



1026. Cylindrotheca gracilis (Brdb.) Grun. 



[Syn. Nitzschia Tcenia ^^^ Sm.]. 

 S.E. — Marfleet Clough (pure) (G. Norman). 



Order CRYPTORAPHIDIE^. 



Family MELOSIRE^. 



Gems MELOSIRA Ag., 1824. 



1027. Melosira nummuloides (Bory)Ag. 

 S.W.— Goole (E. Hunter). 



S,E.; — Dairycoats ; ditch near Stoneferry (G. Norman). 



Trans. V.X.U., 1901 (pub. July igoi), Bot. Series, Vol. 5. 



