r colour. Also two sorts of barnacles (Anatifa) which I got near the
side of the vessel.

We caught today a great number of the animals (Glaucus) I have mentioned
above as having been taken on the 17th of June, as well as on other
occasions. I observed these animals in the water, and found that their
long silk-like antennae had, when uninjured, a length of five or six
inches; they swim with the rounded part first, and the long antennae
trailing after them like tails; the progressive motion is produced by
introducing water into certain sacs, or cavities, and expelling it by a
contraction of the muscles with great violence. I observed their motions
from a boat at first, and afterwards when they were in a glass of water.
I counted the number of times they expelled water in a given time when
swimming, and found the mean of several observations by a chronometer to
give ten strokes in twelve and a half seconds.

We caught again many little animals which I had found on the 15th of
October 1837; south latitude 37 degrees 28 minutes, east longitude 21
degrees 19 minutes; they were shaped like an octagonal crystal,
terminating in a point, containing a brilliant blue colouring matter,
they were about 0.4 inches in length, and were, when undisturbed,
arranged in long strings, only the length of a single animal in
thickness, and of the breadth of two of them abreast; they swam with the
blue-pointed ends downwards, which then looked at a distance like the
legs of a caterpillar, and the long string somewhat resembled a long
gelatinous band in appearance as it passed through the water; but
directly it was touched the animals separated themselves from one
another. These strings were sometimes seen several feet in length.

We caught large quantities of these animals at one time, and found:

The temperature of the water 65 degrees Fahrenheit.
The temperature of the air 75 degrees Fahrenheit.
The temperature of the animals 66 degrees Fahrenheit.

We caught also a fish (Orthogariscus) which the seamen called a
devil-fish.

The length of it was 6 feet 2 inches.
Breadth from fin to fin 3 feet 6 inches.
Length from tip of nose to pectoral fin 2 feet.
Thickness through the breast 1 foot 6 inches.

This fish was infested about its nose with a kind of parasite (Lernaea)
having two long thin tails. The sailors stated that these animals
frequently cause large sores about the nose of the fish, and that when
suffering from this, it will allo