THE EIEST TIDE POOL. 27 



and raise it slowly from the water; it will require 

 little pressure, and adheres well to the paper. I have 

 a specimen before me of seven fronds in a natural 

 group, waved gracefully on a paper seven inches wide 

 by a foot long, and it is one of the loveliest in my 

 collection. 



Fructification. — Minute granules arranged in fours . 



EJSTTEEOMOEPHA. 



This is extremely common, and varies in colour from 

 deep to light green, differing from Jllva as follows : — 



Generic character. — Fronds tubular, hollow, and 

 the structure reticulated, that is, the cells are appa- 

 rent as net-work, and within the cells, when in fruit, 

 may be seen groups of three or four granules in ex- 

 ceedingly small and simple spots. These groups are 

 properly called Sori 



Enteeomoepiia Intestinalis. — This name is de- 

 rived from a word signifying in the form of an intestine. 

 Long, tubular, varying in length and breadth from 

 short narrow fronds, to ribbons tw T o feet long and three 

 inches broad ; always simple, which distinguishes it 

 from another JEnteromorplia very much like it. 



Exteeomoepha Compeessa. — This is not simple 

 in form, but more or less branched, and varies in shape 

 and size according to the depth of the pool and its 

 exposure to the sun. It becomes white in decay, and 

 the children of seaside homes call it sea-thread. 



