120 THE MARINE BOTANIST. 



mouth, ^^ parisitical on Rytiplilsea pinastroides and 

 Polyides rotundus, between tide-marks." 



Carrickfergus. Eoundstone, Cunnemara, very 

 abundant. /3 Templetoni, a slender variety of 

 this plant found in Belfast Bay. Dr. Harvey 

 says of the present species that '^ its peculiar thorny 

 habit, well expressed by the specific name, is so 

 unlike that of any other British species of equal 

 size, that it cannot well be confoimded with any. 

 To the naked eye it bears a greater resemblance to 

 young- specimens of Ry tiphlsea fruticulosa than any- 

 thing else, but is more slender and flaccid, and 

 readily known at all times by the distinctly articu- 

 late stem f.nd branches, which have both externally 

 and internally a very different structure." 



P. atro-rtibescens. Grows on rocks in the sea; 

 not uncommon. Perennial. Summer and Autumn. 

 ^' Stems densely tufted, or covering the rocks in 

 wide patches, from two to six inches high, thicker 

 than horse-hair, subsimple, more or less furnished 

 with long, alternate, erect, simple branches, which 

 sometimes bear a second series, clothed in more 



