102 
GENERA 
BELONGING TO THE FIRST ORDER OF THE SECOND CLASS. 
Telesto. Polypidoms branching; fistular; creta- 
ceo-membranous, opaque, longitudinally striated. 
Liagora. Lichen-formed ; slightly incrusted with 
a chalky substance. 
Ncomeris. Simple, cellular in the upper part; 
embossed in the middle, and scaly in the lower part. 
Acetabularia. Umbelliferous ; umbel flat and 
striated in rays. 
Polyphysa. Stem simple, and crowned with eight 
to twelve pyriform and polypean bodies. 
Nesea. Pencil-form : branches articulated, cylindri- 
cal, and dichotomous. 
Galaxaura. Fistular, dichotomous, and articu- 
lated. 
