CORALLINES. 69 



rises frequently to the height of eighteen inches, in 

 wide spiral turns, and sends out from its stem a 

 series of cells, and at regulated intervals, spreading 



PLUMAKIA FALCATA. 



branches, which are placed one above another on 

 the outer side. The size of the specimen placed 

 in the microscope, is shown at the side of the 

 engraving. 



Another variety among corallines is common on 

 some parts of the British coasts, near low- water 

 mark, on aquatic plants. The representation now 

 given, like some others, was drawn from a specimen 

 by Mr. Boswell of Ozengall, near Ramsgate, who has 



