THE LOWEST-TIDE POOL. 107 



by its purple colour, by the tetraspores circling the 

 branches, and by the tips of the forked branches being 

 frequently clothed with long soft hairs, which Harvey 

 thinks of importance, and requiring further observa- 

 tion, as resembling those hairs in Polysiphonia which 

 bear antlieridia. 



On mussel shells and coralline. 



Ceeamium Eastigiatum. — Small pink tufts, only 

 four inches high, forming regular fans ; of richest car- 

 mine when laid out on paper, and scarcely to be called 

 a common plant. It is one of the rarest and most 

 beautiful of its family. The species was first deter- 

 mined by Mrs. Griffiths, at Torquay. 



CODIUM TOMEXTOSUM. 



(Xame from a Greek word, " the skin of an animal.") 



In all tide-pools, and more frequently still thrown 

 up after a storm, we find a thick, round, green sea. 

 weed, in dense masses, often fringed with parasitic sea- 

 weed. It has a spongy feel, and is not of any value 

 to the collector for the album, but will be a source 

 of interest to the microscopist, who, making a trans- 

 verse section, will discover the cause of its sponginess 

 in the cellular structure. 



Generic character. — Erond green, round or flat, 

 simple or branched, composed of tubular, interwoven, 

 inarticulate filaments. 



Fructification. - — Opaque vesicles attached to the 

 filaments. Common on all the shores of Europe, both 



