74 THE MARINE BOTANISTi 



one to two inches in diameter. '^ Resembling in its 

 fleshy appearance the collapsed body of the common 

 Actiniae (Sea anemone.)" On sub-marine rocks, 

 between tide-marks. Annual. Summer. 



RALFSIA. 



Named in honour of John Kalfs, Esq., of Penzance, the 

 author of an excellent work on the British Desmidiece, 

 &c. 



Frond leathery and crustaceous, adhering by 

 its under-surface, spreading*, zoned, composed of 

 densely-packed filaments. Fructification, sunken 

 warts over the surface, containg* spores fixed at the 

 base of upright filaments. 



RALFSIA VERRUCOSA.— ROUGH RALFSIA. 



" On rocks between tide-marks, common. Peren- 

 nial. Winter. Fronds forming lichen-like patches 

 on the surface of flat rocks, from one to six inches 

 in diameter; when young, orbicular, but becoming 



