except in the lower part of the frond occasionally. In all cases the lobes 
are thick in substance, with a smooth, and sometimes a slightly glossy sur- 
face, and contain a considerable amount of carbonate of lime. The colour, 
when growing, is a pleasant yellowish-green ; this fades, in the herbarium, 
to a pale-green or greenish-white. In drying, the frond does not adhere to 
paper. 
At Plate CXXV. is figured a species of Halimeda, from the 
northern coast; and in now representing one more frequently 
met with, from the south-west coast, [ add a magnified represen- 
tation of some of the curious tubular tissue of which the body 
of the frond is made up. The closely placed and slightly co- 
hering apices of the many-times-forked, lateral branches of the 
filaments that traverse the frond give definite outline to the 
articulations ; and the ime with which they are, in this species, 
rather thickly coated, gives solidity and smoothness of surface. 
H. macroloba is extensively distributed throughout the In- 
dian and Pacific Oceans. In size and the shape of its articula- 
tions it approaches 7. Tuna, but is of a much thicker substance, 
and secretes much more lime than that species. Both vary 
somewhat in the shape of the internodes. 
Fig. 1. Hatrmepa macroLopa,—the natural size. 2. Some of the tubular 
branching tissue of which the frond is composed,—magnijied. 
