appearance of a round loaf of bread somewhat flattened. Of corals, the variety was very great, as may be judged from the circumstance of our having collected twenty-four kinds within so short a space of time. _Fungia_ is quite at home here; for, independently of _F. agariciformis_, _scutaria_, and _limacina_, a long kind was also found, having, like the two former, only one central cavity; they are found in shallow water among other corals. Of tabular corals already known, there remain to be mentioned, _Pavonia boletiformis_, _Madrepora prolifera abrotanoides_, _corymbosa_, _plantaginea_, and _pocillifera_. The inhabitants of the Navigator Isles brought us the little _Psittacus australis_, _Columba australis_, and another very prettily marked dove, having green plumage, ornamented with a dark violet line across the breast, and the feet and head of a reddish purple. It climbed about the sides and roof of its cage, did not leave its perch when it wanted to drink, but stooped down so low as merely to hang by its legs; it would not eat seed, but lived principally on fruit, particularly bananas, all which closely agreed with the habits of parrots. During our passage to the equator, _Sterna solida_ and _Dysporus Sula_ alighted frequently on our vessel, and allowed themselves to be taken. The latter, when old, has a blue beak and red feet; when young, a red bill and flesh-coloured legs. The exterior nostrils are entirely wanting; but in every part are air-cells between the skin and the muscles. Besides these animals, six varieties of _Pteropodes_ were caught; also a _Glaucus_, differing from that of the Atlantic _Janthina penicephala Per._, a _Planaria_, _Salpa vivipara Per._, a _Pyrosoma_, resembling that of the Atlantic, and a _Lepas_, attached to the shell of the _Janthina_. Our collection of Acalephi was extremely rich; of fourteen kinds taken, only one, _Physalia Lamartinieri_, was known to us. Our eight days' stay at the coral island Otdia, afforded us an opportunity to observe or collect about one hundred different kinds of marine animals. It has already been mentioned elsewhere, that the only kind of mammalia found upon this island is a middling-sized cat, which feeds on the fruit of the pandanus tree, and makes its nest in the dead branches, which it easily hollows out. Several lizards have also been found in these islands, such as the striped _Ablepharus_ of O Tahaiti, and a small _Gecko_; a large coal-black lizard was several times seen, but always escaped among the dry pandanus leaves. The fishes are remarkable for the singularity of their form, and the beauty of their colours; those brought to us by the inhabitants belonged to the _Holocentrus_, _Scarus_, _Mullus_, _Chaetodon_, _Heniochus_, _Amphacanthus_, _Theutis_, and _Fistularia_.