266 A NEW I'LOllA OF 



11. P. natmis, L. Native. British type. Area C, N, D. 



Range 1. 



Common in ponds in the low countiy, ascending in Coquetdale 

 above Eothbury, 150 yards. 



12. P. ohlongus, Yiv. Native. British type. Area C, N, D. 



E,ange 1, 2. 



Frequent in peaty pools, especially amongst the moors, ascend- 

 ing in Teesdale to 500 yards. 



13. P. plantaffine us, Dncr. Native. English type. Area C, D. 



Range 1. 



In a pond near Dunstanbro' (Professor Oliver! T.). Ditches 

 at Alnmouth (T.). Hell Kettles near Croft (F. B.). The three 

 stations mentioned under " P. fluitans " in the Flora belong one 

 each to this, P. oMongus and P. rufescens. 



2. RUPPIA, L. 



1. R. maritima,'L. Native. Maritime. British type. Area 

 C, N, D. Range 1. 



Salt water ditches, rare. Warren Mills, in the Coquet near 

 Warkworth, Meggy's Burn, Tees mouth, &c. 



3. ZANNICHELLIA, L. 



1. Z. palustris, L. Native. British type. Area C, N, I). 

 Range 1. 



Ditches and slow streams, frequent. Var. pedicellata, Fries, 

 at the mouth of Meggy's Burn, Willington Burn, &c. 



4. ZOSTERA, L. 



\. Z. marina, L. Native. Maritime. British type. Area 

 C, N, D. Range 1. 



All along the coast in the sea, but not very frequent. 



