THE 



NATURE-PRINTED 



BRITISH SEA-WEEDS: 



A HISTORY, 



ACCOMPANIED BY FIGURES AND DISSECTIONS, OF THE 

 ALG^ OF THE BRITISH ISLES. 



BY 



WILLIAM GROSART JOHNSTONE, F.B.S.E., 



AND 



ALEXANDER CROALL, A.B.S.E. 



NATURE-PRINTED BY HENRY BRADBURY. 



IN FOUR VOLUMES. 

 VOL. II —RHODO SPERM E/E. 



FAM. X.— XIII. 



LONDON: 

 BRADBURY AND EVANS, II, BOUVERIE STREET. 



1859. 



