THE MARINE BOTANIST. 



233 



and shells between tide-marks^ not uncommon. 

 Summer. 



CROUANIA. 



Name in honour of the brothers Crouan, of Brest, celebrated 

 among French Algologists. 



Frond g-elatinous, filiform consisting of a jointed, 

 simple-tubed filament, whose joints are clothed with 

 dense whorls of minute, multifid ramelli. Fructi- 

 fication : 1 . favellidia containing a mass of minute 

 spores, situated near the tip of the ramuli ; 2. 

 tetraspores affixed to the bases of ramuli. 



CROUANIA ATTENUATA.— SLENDER 

 CROUANIA. 



From one to two inches high, of a purplish red 

 colour, very slender and gelatinous 5 much branched, 

 the branches resembling strings of minute beads. 

 " The joints of the main thread are sometimes 

 short, sometimes of considerable length : in the 



