ch reached no farther than the centre, from which the
lobes radiate, when the sac became violently agitated, and made strong
efforts to expel the foreign substance. This animal was very sensitive,
more particularly about the opening of the entrance.

We caught today the lower part of the species of Diphyes which we had
found on the 13th November 1837, in 30 degrees 7 minutes south latitude,
in the Indian Ocean. This animal is thus distributed over a wide range.

We also found a very minute species of the animal similar to one which we
caught on July 1st 1840. Those we caught today were scarcely 0.05 inches
in diameter. They unfolded little wings and flew with them in precisely
the way those did which I described on that day.

Nothing I have seen is more remarkable than the flight of these little
animals; their wings are milk white and very large for their body, and as
they fly, the ends, from their pliancy, bend over, which imparts to the
motion a very graceful appearance; these wings are composed of a very
fine membrane like that forming the wings of a bat. At one time these
little animals hovered over a single spot like a bird of prey in the air,
flapping their wings in just the same manner. At another time they darted
forward with great rapidity, and the vibration of their wings was so
rapid that I could not count them. When folded up they look like very
minute gelatinous animals with a black internal spot, but when touched
their shell can be felt. We saw a shoal of whales today.

We have caught lately a great many small animals, of which the following
is the description; they swim about from one floating substance to
another and are eaten by the little crabs which are numerous in these
seas.

Length of body 0.18 inch.
Length of anterior part of body 0.1 inch.
Length of posterior part of body 0.08 inch.
Length of tail 0.08 inch.
Breadth across back 0.05 inch.
Depth from back to bottom of breast 0.06 inch.

Head and eyes, deep brilliant prussian blue; body brilliant prussian blue
with a bluish green stripe on each side; tail white. Seen through a
microscope these animals appear to be a beautiful dark burnished blue
mottled with silver. The head is remarkably round and regular.

The body is divided into two portions. The anterior portion is made up of
six rings or shields, which lap over one another, and it is furnished
with three legs on each side which terminate in a hooked claw; the
posterior part is covere