(102) 



It may be readily known from the last sjjecies by the extreme tenuity 

 of its filaments, all the divisions of which are of nearly equal diameter 

 throughout, and by the minute flabelliform lateral branchlets. So 

 slender are the filaments, that, when placed in water, they become 

 almost invisible, the dark, dot-like dissepiments alone being apparent ; 

 the whole having the appearance of minute microscopic beads strung 

 on invisible threads, and moving through the water. It is the most 

 delicate of our native species of Ceramiujn, and when floating freely in its 

 own native tide-pool, half invisible from its own transparency, it would 

 be difficult to conceive a more beautiful object. 



CSKAMIUM gracillimum. 



EXPLANATION OF DISSECTIONS. 



Fig. 1. — Apex of a ramulus. 



2. — Kamuius with favellie. — Phyc. Brit. Both magnified. 



