. During the hour I observed
it in a bucket it remained sluggishly floating on the top, and
occasionally swimming by moving its arms slowly along the surface. The
first three that I saw pass the vessel I imagined to be feathers floating
on the water.

Its description is as follows:

Length from head to tail, a c 1.8 inches.
Length from head to root of tail, a b 0.85 inches.
Length from head to first arm 0.2 inches.
Length from head to second arm 0.45 inches.
Length from head to third arm 0.7 inches.

1st arm.
From centre of back to end of round part, d e 0.3 inches.
From e to the end of short tentacula, e f 0.3 inches.
Ditto to long ditto, e g 0.75 inches.
Diameter of round part and attached tentacula 0.4 inches.

2nd arm.
From centre of back to end of tentacula. 0.4 inches.

3rd arm, do. do. 0.25 inches.
Breadth of body between the two first arms 0.13 inches.
Thickness 0.25 inches.

General colour of body, indigo blue, of a darkish tinge; down the centre
of the back a white streak, terminating at the root of the tail; sides
blue, tail blue, quite white underneath, its belly altogether resembling
that of a frog; tail tapering to a point.

1st arm. 26 tentacula attached to the rounded paddle-shaped part of this
arm, the centre tentacle more than twice the length of the others. These
tentacula were so delicate that at the slightest touch they fell off.
Those nearest the body were so small as to be almost imperceptible,
gradually increasing in length as they approach the centre, and then
decreasing to the other side. Centre of paddle-shaped part white,
tentacula blue and white, fringed with dark blue at the extremity.

2nd arm. 18 tentacula to this, centre ones the largest. Same colour as
first arm.

3rd arm. 12 tentacula, not forming such a regular circle as on the two
first arms, and apparently issuing directly from a very short limb
attached to the body.

The general appearance of the skin was that of a frog. It had the power
of contracting itself considerably.

Caught a slug-like animal (Holothuria) this evening, or rather more
closely resembling a caterpillar.

Length from head to root of tail 0.7 inches.
Length of tail (or rather gelatinous protuberance) 0.25 inches.
Breadth (broadest part at root of tail) 0.22 inches.
Narrowest part (near head) 0.15 inches.
Length of head 0.12 inches.

Head of light red colour, mouth apparent, motion of head like a
caterpillar's when touched, shape cylindrical