Spongiocarpece.'] PEysso]!^ELiA. 225 



3. Phyllophora membranifolius^ Good. ^ IFoodw. 

 Ou rocky shores. Common. 



4. Phyllophora palmettoides, /. Ag. Bare. Coasts 

 of Devonshire and Cornwall. 



Genus LYII. PEYSSONELIA, Crouan. 



Gen. Char. Frond membranaceous, orbicular or lobed, at- 

 tached by the whole of its under surface. 



1. Peyssonelia DubyIj Crouan. 



Hab. On old shells and stones in deep water. North 

 of Ireland, Mr. W. Thompson; Birturbui Bay, Professor 

 Harvey and Mr. M^Calla. Dredged by D. L. in Lamlash 

 Bay, Arran. 



After Professor Harvey had detected Teyssonelia in Ire- 

 land, he said, in a letter with wliich I was favoured, that I 

 might be on the outlook for it when I went to dredge ; and at 

 the same time sent me specimens of it. On seeing them, it 

 struck me that I had it on some old shells in my possession^ 

 and I sent him one which I had dredged in Lamlash Bay, 

 with a dark brownish skin on it, which turned out to be 

 true Pei/ssonelia Bahiji. It had been named specifically by 

 M. Crouan, in honour of M. Duby. See Phyc. Brit., 



