Gastrocarjoea..'] halymenia. 227 



when described by Mr. D. Turner in the ' Historia Pucorum/ 

 it was regarded as exceedingly rare. Of late, however, it 

 has been found in many places, especially in Ireland. 

 Though found in Orkney by Rev. Mr. Pollexfen, and by 

 D. L., jun., in Argyleshire, it seems very rare in Scotland. 

 The splendid figure of it in Phyc. Brit., PL xiii., is thought 

 rather dark in colour. 



2. Kalyiienia Ddbyi, Harve?/, 



Tliis is a rare Alga, found by Miss AYarren and by the 

 Rev. Mr. Hore at Plymouth. It has not been met with in 

 Scotland. In form it resembles Iridcea edulis, but in struc- 

 ture it is more like Kalymenia reniformis.. 



Genus LX. H.U.YMENIA, AfjardJi. 



Gen. Char. Prond compressed or flat, pinky red, gelatinoso- 

 membranaceous, consisting of a delicate membrane, whose walls 

 are separated by a very lax net-work of jointed fibres ; cells of 

 the membrane minute, coloured. Fnictification, masses of spores 

 (faveUidia) immersed in the frond, attached to the inner surface 

 of the membranous periphery. — The name is from two Greek 

 words, signifying the sea and a membrane. — Harvey. 



I. Halymenia ligulata, Agardh. (Plate XIII. fig. 52, 

 a good representation of two varieties of this plant.) 



