THE MARINE BOTANIST. 145 



while its earlier states constitute Lamouroux's 

 various species of Melohesia^ To observe the 

 internal structure of the Corallines, it is necessary 

 to macerate a portion in weak acid until the cal- 

 careous matter be removed. In drying they re- 

 quire but very little pressure. The plant figured 

 under the name of Lithocystis Allmanni in the 

 Phyc. Brit., is now ascertained to be identical 

 with the Hapalidium Phyllactidiuvi of Kiitzing. 



GENERA OF THE CORALLINE TRIBE. 



Sub-order of the CoraUinese. Frond fihform, 



articulated. 



Coralline, Frond pinnated. Ceramidia terminal, 

 simple. 



Jania. Frond dichotomous. Ceramidia tipped 

 with two horn-like ramuli. 



Sub-order, NuUiporeae. Frond crustaceous or folia- 

 ceous, opaque, not articulated. 



Melobesia. Frond stony, forming either a crusta- 

 ceous expansion, or a foliaceous or shrub-like body. 



L 



