purple barnacles and pink nautili, seeking on the
shores of these shining islands its prey, the curious formation of its
mouth being admirably adapted to enable it, whilst swimming under these
painted floating islands, to crop off what it lists.

There were scarcely any gelatinous animals in the sea this day; but many
Janthina shells and Velella were round the ship, to which were attached
barnacles of different species; amongst this group of islands numerous
crabs were swimming about and running over them. Animals resembling a
wood-louse were also in the sea, swimming and running about the floating
shells and barnacles.

We caught also a new species of Janthina, the float of which, instead of
being nearly round and extending over the shell on each side, was spread
like a spiral fold from the shell; the breadth of this fold was 0.45
inch, close to the mouth of the shell, and it gradually tapered off to a
point, its length being 3.6 inches. This float being curved round like
the tail of an animal, the whole thing bore the appearance of being a
sort of snake, of which the shell was the head; the sailors called them
caterpillars before I had examined them. The float was composed of two
parts, one of which was only froth and the other was apparently some
extraneous substance attached to the froth. The shell is very different
from those of the other nautili in being much more deeply indented with
circular striae.

July 18. South latitude 19 degrees 49 minutes; west longitude 3 degrees
10 minutes 15 seconds.

We have lately caught several specimens of Creseis. Each consists of a
cylindrical tube, increasing in size from its broadest extremity to the
centre where it is thickest, and decreasing from the centre to its other
extremity, where it becomes a fine point. It is throughout its extent
gelatinous, transparent, and of strong consistency.

There is apparently a valve at its broadest extremity.

Length 1.1 inch.
Breadth in centre 0.1 inch.
Breadth at mouth of wide extremity 0.08 inch.

We have several times caught a triangular, transparent, gelatinous
animal; it is 0.18 inch in thickness, and in the outer pulpy gelatinous
mass there is an interior sac, and strong muscular bands are marked
across this. The sac is composed of three lobes, two of which have
apparently no external opening, whilst at the end of the main lobe there
is one which closes with a valve; through this I have seen them take in
little animals, whi