PLATE IX. 



A. CLADOSTEPHUS, page 54. 



Fig. 1, C. verticillatus ; the natural size. 2, a whorl 

 of ramuli on a fragment of the stem. 3, a barren 

 ramulus. 4, a fertile ramulus, from a winter speci- 

 men. 5, cross section of the stem ; magnified. 



B. SPHACELARIA, page 55. 



Fig. 1, S. scoparia; the natural size. 2, pinnated 

 branch or plumuli from the same ; magnified. 3, S. 

 cirrhosa, the natural size. 4, plumuli of the same. 

 5, apex of a ramulus, with sphacelated tip. 6, part 

 of ramulus, with fruit ; magnified. 



C. ECTOCARPUS, page 58. 



Fig. 1, E. siliculosus ; the natural size. 2, silicular 

 spore of the same. 3, branch with fruit. 4, branch 

 of E. littoralis, in fruit. 4, immersed spore. 



D. MYRIOTRICHIA, page 63. 



1, Tufts of M. claveeformis growing on Chorda lomen- 

 taria ; the natural size. 2, a frond. 3, ramulus, 

 spore and fibres, from the same ; magnified. 



