130 BETTISH SEA-WEEDS. [Ilelanosjierinece. 



pencils of filaments are produced at the axils of tlie spines 

 when in a young state^ but they soon fall off. 



2. Desmarestia viiiiDis, Lamour, 



Hab. In the sea^ on rocks and stones^ often in shallow 

 wat?r. • 



This is DlcJdoria vir'idis, Greville; so named from its 

 singular change of hue when taken out of the water. It 

 seems to be pretty generally diffused in England^ Scotland, 

 and Ireland. It is very common on the Ayrshire coast. 

 Colour olivaceous when growing, though in shallow water 

 it often has that foxy colour mentioned by Dr. Drummond. 

 Its appearance is very delicate and beautiful. Dr. Greville 

 mentions that it has no pencil filaments. In a very young 

 state the main branches are beset with fine filaments, but 

 they are not pencilled. It is exceedingly difiicult to pre- 

 serve these fine filaments in preserving specimens. Though 

 they appear beautiful in the water, it requires the utmost 

 care to preserve them when removed from their native ele- 

 ment. AYe have proof that the Ecv. AY. S. Hore has suc- 

 ceeded in preserving them, by a beautiful specimen he 

 kindly sent us. Dr. Drummond, of Belfast, also has suc- 

 ceeded ; and he says that he allows his specimens, when 

 laid out on the paper, to dry without pressure. 



