LIST OF PLATES 



I. An Unusually Coloured Raia clavata, Linnaeus. 

 II. Pylaidla varia, Kjellman, and Ectocarpiis Landsburgii, Harvey. 

 III. Canuella perplexa, sp. nov., and Longipedia coronata, Claus. 

 IV. Scottish Desmidieae. Plate I. 



