Notes on Marine A Igoe. By Edward A. L. Batters. 351 



wlien dry and mounted) soft, gelatinous. Filaments slender, 

 points blunt and slightly, thougli distinctly, curved. Striae 

 transverse, not very distinct, separated from each other by 

 intervals of about half the width of the filament. 



On the muddy banks of tbe river from its mouth to the 

 ** Plantation." Very common. 



6. Oscillatoria insignis. Thwaites, in Harv. Phyc. Brit., PL 251. 0. 



A thin, blackish-brown, gelatinous stratum hardly to be dis- 

 tinguished from the mud on which it grows. Filaments thick, 

 straight ; apices obtuse and curved. Striae close and conspicuous. 



On mud, Koly Island, and in great plenty on either side of the 

 stakes after leaving Fenham Flats to cross to the Island. 



7. Lynghya ferruginea. Ag. Harv. Phy. Brit., PI. -311. (L. aeru- 

 ginosa Ag. ; L. aestuarii, Liebm.). 



A loosely interwoven, dark green or brownish stratum of very 

 slender threads. Filaments tolerably clearly annulated, wall of 

 the tube very thin though distinct. 



Muddy pools at the mouth of the river. Eare. 



8. Rivularia atra, Roth. var. confluens. 



Fronds " flattish owing to the coalescence of several indivi- 

 duals," otherwise like the normal form, with which it is identical 

 in microscopical structure. 



This variety of R. atra often forms a flat expansion of two or 

 three inches in diameter on rocks, and looks at first sight quite 

 distinct from the almost globular fronds of the normal type of 

 the species. 



Muddy rocks near the " Greenses," and at " Sharper Head." 

 Common. 



9. Hormospora ramosa. Thwaites in Harv. Phyc. Brit., PI. 213. 

 Fronds very minute, invisible to the naked eye. Filaments 



branched, colour cells oval, when mature. 



Whilst examining a specimen of Cladophora flavescens undiex \he 

 microscope I discovered a few specimens of this beautiful micro- 

 scopic alga. 



Fenham Flats. 



10. Cladophora flavescens. Kut%. Harv. Phyc. Brit., PI. 298. 

 Filaments very slender, interwoven into large floating masses 



of a pale yellowish-green colour. Branches irregular, distant, 

 mostly alternate, sometimes dichotomous, patent or nearly so, 

 upper branches few and mostly secund. Joints six to eight times 

 longer than broad. The colour of this alga is usually a fine 



