2l6 YORKSHIRE NATURALISTS' UNION. 



102 2. Nitzschia longissima(Brdb.) 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. Kitzschia Smithii Ralfs. [Syn. N. spedahiUs 



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

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



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



[Syn. Nitzschiella acicularis Rabenh.]. 



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



Mid W. — 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. Loflsome Bridge, 

 near Wressle. Nevvsholme. Dairycoats; Cotlingham (G. 

 Norman), 



1025. Nitzschia gracilis (Breb.). 



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

 Mid W.— Roundhay (W. B. Turner). 

 S.E.— Waghen. 



Genus CYLINDROTHECA Rabenh., 1859. 



1026. Cylindrotheca gracilis (Breb.) Grun. 



[Syn. Nitzschia Tienia \V. Sm.]. 

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



Order CRYPTORAPHIDIE^:. 



Family MELOSIRE.^, 



Genus MELOSIRA Ag., 1824. 



1027. Melosira nummuloides (Bory) Ag. 

 S.W.— Goole (E. Hunter). 



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



T^^ns. Y.N.LT., 1901 (puli. July 1901). Bot. Series, Vol. 5. 



