238 TRANSACTIONS, NATURAL HISTORY SOCIETV OF GLASGOW. 



Order III.— DuMONTiACEiE. 



Dumontia filiformis, Grev. — Very common all 

 along the coast. 



Dilsea edulis, Stackh. — Common on islets off Lis- 

 more. 



Order IV. — Nemastomace^. 



Furcellaria fastigiata, Lamx.— Common on all 

 sandy parts of the coast. 



Order V.— Rhizophyllidace^. 



Polyides rotundus, C. Ag. — Occasionally on rocks 

 in Loch Etive. 



Order VI — Squamariace^. 



Petrocelis cruenta, J. Ag. — "Appin" (Carmichael). 

 On rocks on islets off Lismore. 



Order VII.— Hildebrandtiace^. 



Hildebrandtia prototypus, Nardo., var. rosea, 

 Kiitz. {H. rosea, Phyc. Brit.).— On rocks at North 

 Connel. 



Order VIII. — Coballinace^. 



Corallina ofiQ.ciualis, Linn. — This species, so 

 common on many parts of the shores of Great 

 Britain, is scarce in the Oban district, and very 

 dwarf even where it does occur. 



C. rubens, Ellis et Sol. — At Lismore. 



Melobesia mernbranacea, Lamx. — Common on 

 rocks at various localities. 



Lithe thamuion polymorphum, Aresch. (Melobesia 

 polyniorpha, Phyc. Brit.). — Very common on rocks, 

 passim. 



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