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GENERA 
BELONGING TO THE SECOND ORDER OF THE SECOND 
CLASS. 
Jama. Resembling moss, hairy and dichotomous ; 
numerous ovaria. 
Corallina. Compressed and trichotomous. 
Cymopolia. Cylindrical and dichotomous ; neck- 
lace-formed. 
Amphiroa. Branches dispersed, dichotomous, tri- 
chotomous, or verticillated ; articulations separated. 
Halimeda. With flat or compressed articulations, 
generally fan-shaped. 
GENERA 
BELONGING TO THE THIRD ORDER OF THE SECOND CLASS. 
Udotea. Fan-shaped, marked with curved and 
transverse lines. 
Melobesia. Chalky incrustation ; cells very small 
and dispersed. 
