— Ill — 
“ Frigate Island has but sparse vegetation, no large timber 
trees, only here and there clumps of bushes. It is entirely of 
granite, and I think of more recent date than Curieuse, which 
I visited later. The granite of the mountain is less degraded, 
and has fewer fissures, and there is a scarcity of the detached 
bou'ders on the lower parts of the island, compared with 
those I saw elsewhere. 
“ The reef near Mr. Savy’s house makes off to some dis- 
tance, and I was astonished to find it consisted in a great 
measure of the Scarlet Tubiporu Musica, so brilliant when in 
the water but tiiat grows dull directly it is dry. I have how- 
ever seen some pieces from St- Braudon preserve their colour 
many mouths. The colour instead of being a bright scarlet is 
orange, so it is possible it may be another species of the 
Tubiporoe, it being now decided by zoologists that there are 
others besides the musicct, distinguishable by the colour of the 
polyps. These auimais appear to have been more closely 
studied than any other of the corallines. “ The Tubiporm live 
in societies but do not appear to be united, as the compound 
polyps. A group presents several stages of tubes, one above 
the other, but appear slightly to diverge as radiating from a 
common centre ; they are separated by iutervals and support 
each other by horizontal laminae. From each tuba issues a 
membranous animal of a grassgreeu colour, the mouth being 
surrouuced by 9 tentacles, furnished along their edges with 
rows of minute fleshy papilioe.” 
“ I found some interesting Algcea the same as those at 
Mauritius, but very large. The Laurencia papillosa, Padina 
pavonia and H ydroclatlirus cancellahos. The fronds of the 
Qracilaria crassa so small in Mauritius were very large, and 
it lay in masses on the shore. The lovely Plocamium cornuta 
that I have taken at Flacq and Flat Island, was also abundant 
of the most brilliant scarlet. To my sui’prise I found a plant 
dead on the beach I have looked iu vain for at Mauritius, the 
Bryopsis plumosa. This elegant little plant is found the world 
over from the cold north in the Feroe Islands through the 
tropics southward, to Cape Horn and jN"ew Zealand. Between 
the shore and the reefs grows the Oaulerpa denticulate but I 
