degrees 47 minutes; west longitude 3 degrees 5
minutes 30 seconds.

Found a small animal (Cymothoa) like a wood-louse, similar to the one we
caught on the 15th of this month and to another taken on the 21st of
November 1837. It had seven legs on each side, besides the five which
when taken out of the water it folded over its abdomen; the colour the
same as before described.

Length 0.52 inch.
Width over broadest part 0.2 inch.
Length of antennae 0.2 inch.

Illustration 4, exactly the size of life, gives a good idea of it. It
lived out of the water for two or three hours and did not die until put
into spirits; it ran about on the table as well as it swam in the water,
so that it was evidently amphibious. It swam about from a dead shell of
the Velella, to a nautilus, and from that again to some barnacles; each
shell that it reached it climbed up, and folding up its fins ran all over
it, so that it appeared like a little navigator which was roving from
island to island in the ocean, seeking food and nourishment from all of
them. Are not the ways of nature very wonderful? This little animal was
at least 500 miles from any land, as we term it, yet it was surrounded by
sunny islands, teeming for it with the most delicious food, and where it
either basked in the warm daylight, or shaded itself in some oozy recess,
as seemed most pleasant to it.

When walking on these substances it used its antennae exactly as insects
do, and showed an extraordinary degree of susceptibility when touched. I
do not know that I have ever seen an animal which more decidedly evinced
an acute sense of feeling and dread of pain.

The animal here described belongs equally to the Indian and Atlantic
Oceans, and appears, as far as my experience goes, never to venture to
the south of 25 degrees south latitude. This is now the third species of
animals which I have found to be common to the Atlantic and Indian
Oceans, and which never venture beyond the warmer latitudes.

The question is how they got round the Cape of Good Hope, or Cape Horn?

Might we not hence infer that there was a time when the continent of
Africa did not exist? and might not this argument be much extended? It
could be combated by none of those causes which are advanced relative to
the distribution of species on land; for,

1. The temperature of the water in southern latitudes is very cold at all
seasons of the year.

2. These animals are extremely susceptible of all changes