IN NOETHUMBERLAND AND DURHAM. 305 



OSCILLATORIA THERMALIS, HaSS. 



In a hot-water stream at Monkwearmouth Colliery. 



OSCILLATORIA SPLENDIDA (?), Orev. 



Stream in Hylton Dene ; abundant. 



OSCILLATORIA MUSCORUM, Ag. 



On Algae in stream above Bardon Mill. 



OSCILLATORIA NIGRA, VaucJl. 



Ashburn and Hedworth. 



OSCILLATORIA CONTEXTA, Cami. 



On footpaths, &c., round Sunderland; common. 



OSCILLATORIA TEREBRIFORMIS, Ag. 



Ditches near Sunderland, and in streams near Hartlepool. 



OSCILLATORIA DECORTICANS, Grev. 



On sluice at Bardon Mill. 



Var. B. on timber near Sunderland. 



MiCROCOLEUS REPENS, Hcirv. 



Side of stream at Monkton. 



Raphidia viridis, Hass. 



Covering stones on the margin of a deep pond near Brockley 

 Whins Station, in small circular patches of a dark green or 

 blackish colour. 



Spirillum minutissimum, Hass. 



In pools above high-water mark near Byers' Quarry. 



Sph^rozyga elastica, Ag. 



At Ryton Willows and Cullercoats. 



Ulva bullosa, Roth. 



Brackish ditches at Hartlepool. 



