G. MELQBESIA. 
1.4 1 
of America ; from their rarity in collections, it is pro- 
bable they are not very numerous. 
FAN-SHAPED. 
1. Udotea Jiabellala. Stem simple, with a fibrous 
root ; expansions divided in fan-shaped branches, 
which are rarely proliferous. Plate 12. fig. 1. 
Equatorial seas of America. 
CONGLUTINATED. 
2. Udote a conghitinata. Stem simple, with a fibrous 
root ; expansion plain, and fan-shaped. 
Coasts of the Bahamas. 
MELOBESIA. 
Stony Polypidom, found in thin patches of greater 
or less expansion on the surface of the Thalassio- 
phytes ; cells very small, and placed at the summit 
of small tubercles dispersed upon the patches. 
The Melobesias form patches of various sizes, 
sometimes round and regular, and at others irre- 
gular ; some wholly cover the marine plants with a 
calcareous layer, so as entirely to conceal their 
form and colour ; whilst others merely appear like 
powder or mouldiness on the surface of the plants, 
according to the size of the patches, which resemble 
small scales or atoms of dust. On these patches 
may be discerned projecting tubercles, having in their 
centre a small hole, or cell, which serves as a dwell" 
