colour of G. simplicifilum is wuch brighter than that of 
G. equisetifolia, but this character is not always to be de- 
pended upon. Perhaps the other differences mentioned are 
equally uncertain, and then this supposed species would be 
reckoned but a slender variety of G. equisetifolia, whose 
peculiar aspect was due to local circumstances. I have usually 
observed G. equisetifolia on rocky shores, exposed to considerable 
surf, while the most abundant locality for G. simplicifilum, and 
where it keeps all its peculiar characters without change, is on 
the extensive sandy beaches of Wexford, in comparatively 
quiet water. 
Fig. 1. GRiIFFITHSIA SIMPLICIFILUM :—the natural size. 2. Portions of a 
branch, magnified. 3. One of the ramelli:—highly magnified. 
