The sea was full of small acalepha, and in the midst of a shoal of these a whale was seen.
November 19.

Latitude 25 degrees 50 minutes south; longitude 106 degrees 22 minutes east.
Birds first re-appeared again.

I saw a large flock of two kinds, but was not near enough to ascertain what they were.

I have before noted the fact that almost at the exact point where the southern birds of the family Longipennes disappeared those sea-jellies (acalepha) which have the power of stinging, began to show themselves; previously to our passing this point I had not seen one: I saw several however today at no great distance from this flock of birds.
We saw float by this afternoon one of the acalepha, apparently about two feet long and shaped generally like a water snake; its tail had fins like that of an eel, of a purplish tinge; I could distinctly see its head and various vessels in its interior for it was quite transparent.

We had no net ready but threw a stick with a piece of string attached to it, the string passed under it but in pulling up cut through it as though it had been jelly.
Caught an animal (Cymothoa) shaped exactly like a woodlouse: Length 0.4 inches.
Length of antennae 0.15 inches.
Breadth of body 0.12 inches.
It had six legs, and a tail-like fin behind on each side, and nine rings on its back so that it could roll itself almost into a ball, these rings extended no farther than from its head to within 0.12 inches of its hinder extremity; colour very pale blue down the back, bright prussian blue on each side; it crawled about when taken out of the water, and lived for some time; its fins, or fin-like legs, when it thus crawled about, were folded under its tail; eyes distinct.
MOLLUSCA.
November 20.