112 



ALPHABETICAL INDEX OF THE 



Oscillatoria spiralis. Summer. On rocks by the sea- 

 side. Appin. 



Oscillatoria subsalsa. Summer. Brighton. 



Oscillatoria subuliformis. Summer. In a brackish 

 ditch, Shirehampton, near Bristol. 



Pad in a Pavonia. Summer. Exmouth ; Sidmouth ; 

 Torquay. 



Peyssonelia Dubyi. Summer. On old shells. On the 



shores of the British Islands. 

 Phyllophora Brodisei. Summer and spring. Whitsand 



Bay ; Bovisand. Scotland. Belfast Bay. 

 Phyllophora membranifolia. Winter and spring. On 



rocky shores between tide -marks. Frequent. 

 Phyllophora palmettoides. Winter and spring. Ex- 

 mouth ; coast of Cornwall. 

 Phyllophora rubens. Winter. Common on the rocky 



shores of England and Ireland. 

 Plocamium coccineum. Summer and autumn. Mount 



Edgecumbe ; Bovisand; Whitsand Bay; Torquay; 



Exmouth. 



Polyides rotundus. Autumn and winter. On stones 

 and rocks in the sea. Very abundant. 



Polysiphonia affinis. Summer. On rocks in the sea. 

 Carnlough, near Glenarm. 



Polysiphonia atro-rubescens. Summer and autumn. 

 Bedding Point ; Bovisand; Whitsand Bay; Torquay. 



