NOETHUMBERLATfD AND DTJKHAM. ' 115 



heterophyllus, florihmdtis, and B-rouetii are frequent, the true^^?- 

 tatus and trichophyllus apparently rare. The former grows in 

 the Breamish at Branton, and abundantly in the Weel at an 

 elevation of 500 yards ; and the latter we have gathered in a pond 

 near the edge of the cliff a little north of Marsden. 



2. R. Baudotii, Godr. Native. English type. Area D. 



Eange 1. 



In the salt-water ditches about Seaton Carew (Rev. T. J. A. 

 Hort). Ko doubt this occurs in other places in brackish water, 

 but it cannot be distinguished from the preceding without close 

 examination. It is abundant in the salt-marshes at the Tees' 

 mouth on the Yorkshire side. 



3. R. circinatus, Sibth. Native. English type. Area C. 



Eange 1. 



In the lough at Holy Island, where it was first noted by Pro- 

 fessor Babington. Swinhoe Links ("W. Eichardson). Ponds on 

 Alnwick Moor (T.). 



4. R. Jlmtans, Ita-m. Native. English type. Area C, N, D. 



Eange 1. 



Erequent in the Cheviot -land streams, Tweed, Breamish, 

 Wooler "Water, Aln, and Coquet. In the North Tyne near Bel- 

 lingham (Mr. Makepeace !). In the Skerne a little above its 

 junction with the Tees (W. Eoggitt). 



5. R. hederaceus, L. Native. British type. Area C, N, D. 



Eange 1, 2. 



Frequent in watery places, especially in the upland tracts, 

 ascending to 350 yards in Dunsdale, 400 yards in Teesdale, and 

 300 yards in Allendale, Weardale, and Coquetdale. 



6. R. ccenosiis, G:us3. Native. English type. AreaN. Eange 1. 



In the Wansbeck district in a plashy place by the road-side 

 between Hartbum and Scot's Gap Station, 150 yards (B.). 



