G. AMPHIROA. 133 



form of the articulations and by the division of the 

 branches. 



Their organisation and colour resemble those of 

 the Corallinas. 



Their height does not appear to exceed a decimetre. 



They are said to originate from the Antilles, and 

 chiefly from Jamaica. 



BEARDED. 



1. Cymopolia harhata, Dichotomous; articula- 

 tions cylindrical ; branches with hairs at their extre- 

 mities. 



Coast of Jamaica. 



NECKLACE-FORMED, 



2. Cymopolia rosarium. Articulations nearly 

 globular, the lower cylindrical ; separated from each 

 other by a very small interval. 



Caribean sea. 



AMPHIROA. 



Plant-like and articulated ; branches dispe?sed, 

 dichotomous, trichotomous, or verticillated ; articu- 

 lations long, and separated from each other by a bare 

 and horny substance. 



The Amphiroas resemble the Corallinas in the sub- 

 stance both interior and exterior of the articulations ; 

 their colours exhibit the same hues ; their height is 



