248 THE MARINE BOTANIST. 



ally attenuated filaments. These last characters 

 distinguish it from (7. nodosum and C. fastigiatum. 

 Though existing on all our coasts, from north to 

 south, it does not appear to be very abundant any- 

 where, seldom growing in society ; the tufts being 

 thinly scattered here and there though the rock- 

 pools. When growing, few algse are more delicately 

 beautiful ; and even in a dry state it forms a very 

 handsome object, the brilliancy and regularity of 

 the dot-like joints, connected by hyaline, glistering 

 spaces, having the effect of a piece of fine tracery." 

 Grows on the smaller algae in tide-pools, some- 

 times on rocks. Annual. Summer. Found on the 

 British coasts from Orkney to Cornwall. 



CERAMIUM GRACILLIMUM.— GRACEFUL 

 SLENDER-BRANCHED CERAMIUM. 



'' Frond excessively slender, of nearly equal dia- 

 meter throughout, very flaccid and gelatinous, 

 dichotomous ; the branches set with minute, flabel- 

 liform, dichotomous ramuli ; articulations colourless. 



