1 7° YORKSHIRE naturalists' UNION. 



S.E. — Wressle. Cottingham ; Spring Ditch; Skirlaiigh; 

 Hornsea Peat Deposit (G. Norman). 



845. Navicula peregrina (Ehrenb.) Kiitz. 



[Syn. Pinnularia peregrina Ehrenb.]. 

 S.W.— Hatfield district; Rossington (M. H. Stiles). Goole. 

 Coley, near Shelf. AUerton. 



S.E. — Tickton. Newsbolme, near Howden. Stoneferry (G. 

 Norman). 



Var. menisculus Schum. 

 Mid W. — Linn Gill. Hawks worth Springs. 

 N.W.— Mickle Fell. 

 N.E. — Ingleby Greenhow. 



846. Navicula g:racilis Kiitz. 



S.W. — Cusworth district; Firsby reservoirs ; Roche Abbey 

 (M. H. Stiles). Shipley Glen. 



Mid W. — Penyghent. Moughton Fell. 

 N.E. — Ingleby Greenhow. Saltersgate (G. Norman). 

 S.E— Spring Ditch; Marfleet; Ditch near River Hull (G. 

 Norman). 



Var. neglectum (Thw.). \^^\\.Schizonemanegkcttim\^\\\s^ 

 Rabenh. ; Collefonema neglectum Thw. ; Navicula 

 gracilis Kiitz. var. schizonemoides V.H.]. 

 S.W.— Roche Abbey (M. H. Stiles; J. N. Coombe). 

 Mid W. — Ingleton. Shipley Glen. Ribblehead. 

 S.E.— Hull; Wawne (G. Norman). 



847. Navicula acuminata (W. Sm.). 



[Syn. Pinnularia acuminata W. Sm.]. 

 Mid W.— Adel Bog. 

 N.W.— Cronkley Fell. 

 N.E. — Scarborough Mere. 



848. Navicula viridula Kiitz. 



[Syn. Pinnularia viridula (Kiitz.) Rabenh.]. 

 S.W.— Roche .\bbey (J. N. Coombe; M. H. Stiles). Askern 

 and Cusworth districts (M. H. Stiles). 



Trans. Y.N.U., 1901 (pub. July igoi). Bot. Series, Vol. 5. 



