CORALLINES. 



125 



hippuris, represented in Fig. 46, has a singular resemblance to the 

 Common Mare's Tail (Hippuris vulgaris). 



Fig. 46. Isis hippuris. 



Four other species of Isidians are known. The same family includes 

 the genera of Melitsea and Mopsea, which, however, our limits forhid 

 us to describe. 



CORALLINE. 



The group of Corallines consist of a single genus, Corallium, having 

 a common axis, inarticulate, solid, and calcareous, the typical species 

 of which furnishes matter hard, brilliant, and richly coloured, and 

 much sought after as an object^ of adornment. This interesting 

 zoophyte and its product require to be described with some detail. 



