iyo YORKSHIRE Naturalists' union. 



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

 Hornsea Peat Deposit (G. Norman). 



845. Navicula peregrina (Ehrenb.) Kiitz. 



[Syn. Piniiularia peregrina Ehrenb. ]. 

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

 Coley, near Shelf. Allerton. 



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

 Norman). 



Var. menisculus Schum. 

 Mid W. — Linn Gill. Havvksworth Springs. 

 N.W.— Mickle Fell. 

 N.E. — Ingleby Greenhovv. 



846. Navicula gracilis Kiitz. 



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

 (M. H. Stiles). Shipley Gfen. 



Mid W. — Penyghent. Moughton Fell. 

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

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

 Norman). 



Var. neglectum (Thw.).- S^^jw. Schizonema neglectuini^V\i\s .) 

 Rabenh. ; Colietonema neglectum Thw. ; Navicula 

 gracilis Kiitz. var. schizofieinoides 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 acuinitiata W. Sm.]. 

 Mid W.— Add Bog. 

 N.W.— Cronkley Fell. 

 N.E.- — Scarborough Mere. 



848. Navicula viridula Kiitz. 



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

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

 and Cusworth districts (M. H. Stiles). 



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



