Their dimensions were: Total length 1.0 inch.
Length of tails 0.57 inches.
Ditto of fore part of body 0.25 inches.
Ditto of hind part of body 0.15 inches.
Breadth across body 0.25 inches.
They were covered with a transparent shell, marked with grey spots and lines; the hind part of the body, near the tail, being darker than the fore part, as though the intestines were seated there.

These little creatures adhered strongly to any substance that they were laid on, and caused an irritating feeling to the skin if placed on it; they swam with great rapidity when put into seawater, and in their movements in swimming much resembled a tadpole; their tails were merely long transparent fibres.
We caught also several transparent bodies, shaped like a balloon (Beroe ?) These consisted merely of a sac.

At the flat end of the spheroid was a small ring of a pink colour, from which ran lines forming the ribs, which supported the sides of the animal.

There were eight of these: they possessed great irritability, and if the animal was at all injured, a rapid and continued motion was propagated all along them.

Some of these animals were between two and three inches in length, but they were so delicate that it was impossible to examine them, for they fell to pieces directly they were touched.