This one had a much larger sac, or float, than the others, and the float was furnished with a crest.
July 15.

South latitude 20 degrees 20 minutes; west longitude 2 degrees 17 minutes.
The same animals mentioned in the last paragraph of July 14th were again caught this day.

A great number of the Velella were also taken.
Caught a small fish: Length 1.2 inches.
Breadth over roundest part 0.48 inches.
For a particular description, and figure of a finer specimen, see below.
The mouth and eyes of this fish were placed in a curious manner.

Its food appeared to be the same as that of the other fish taken this day.
Caught two curious little crabs (Nautilograpsus) one pale blue, and the other of a pale pink colour: also, another little pale blue crab: Length of antennae 0.15 inches.
Length of body 0.34 inches.
Breadth of ditto 0.12 inches.
Caught a small animal shaped like a wood-louse (Cymothoa) having nine rings apparent on the back, and I think seven legs on each side, also, a tail-like fin on each side, which, when closed under its belly, formed a sort of shield for the lower part of the abdomen.

Antennae, transparent with pale brown tips, and a few pale brown spots in them, colour pale blue down centre of the back, dark prussian blue on each side.