146 



MARINE AQUARIA FOR ROOMS. 



another not uncommon sea-weed (Halidrys siliquosd) 

 grown in tolerably large marine tanks, and looking 

 both healthy and attractive. The Zostera marina 

 a true flowering plant, and not a sea-weed may even 

 be grown where the tank is large enough. This is 

 undoubtedly a most useful plant for giving off oxygen. 

 Mr. Shirley Hibberd recommends Codium tomentosum, 



Fig. 106. 



Fig. 105. 



Corallina ojficinalis 



Plocamium coccineinn. 



not only on account of its growing easily, but because 

 it is a favourite food-plant for many mollusca, &c. 

 For it should be remembered that if certain animals, 

 hereafter to be mentioned, are introduced, they will 

 feed on many of the sea-weeds ; so that the latter 

 have to serve the double purpose of aeration and 



