C0NFERVACE.E. 263 



alternate or secund, short, spreading, recurved, blunt at 

 the tip ; cells about twice the length of their diameter. 



This species grows in deep water during summer, and 

 is annual. It resembles C. rectangularis in general 

 character and appearance, but the branchlets of that 

 plant are opposite, while those of C. Macallana are 

 alternate or secund. 



Cladophora falcata. The sickle-shaped Clado- 

 phora. 



Fronds growing in dense tufts, rigid, slightly interwoven, 

 curved, from three to four inches high, of a bright, dark- 

 green colour and crisp texture, much branched; branches 

 repeatedly divided, sickle-shaped ; branchlets short, secund, 

 obtuse ; cells about three times the length of their dia- 

 meter, nearly uniform throughout the frond, transparent at 

 the margin. 



This very elegant Cladophora was first gathered by 

 Dr. Harvey, on the coast of Kerry, in 1845, and sub- 

 sequently by Miss White in Jersey. It grows in rock- 

 pools near low-water mark, and is annual. The curva- 

 ture of the frond is the distinctive character of this 

 plant, and it is a little doubtful whether that be a suffi- 

 cient title to constitute a valid claim to specific rank. 

 In other respects it resembles C. la>tevirens. 



Cladophora glaucescens. The glaucous Clado- 

 dophora. 



Fronds growing in tufts, very slender, much branched, 

 from two to five inches long, of a glaucous green colour, and 

 softish texture ; branches somewhat zig-zag in the main di- 



