Proc. R.I.Acad., Vol. XXXI. 



Part 15, Plate V. 



G. H. Petbybridge, photo. 

 Fig. I. — Litholhamnium sand from beach in Mannin Bay. 



T. J. Westropp, photo. 



Fig. 2. — Fucus farms in Achill Sound. 

 Clare Ireland Survey. — Cotton : Marine Algae. 



