These animals are extremely susceptible of all changes of temperature.
3.

They have no means of warming themselves by exercise or motion.
4.

The species of food which they subsist on is confined to the latitudes in which they themselves live.
5.

They would have to traverse great distances in ungenial climes, and contend against adverse winds, the children of placid seas and genial suns hurried into giant waves and chilling storms.
6.

It is not probable that they are swept along in currents, from the circumstance that in the one which flows along the coast to the eastward of the Cape we could find none of them, whilst upon its very edge they were in abundance.
Could however their eggs be swept along by a current, and after having been wave-tossed for months or years, be at last borne into waters sufficiently warm to hatch them, and the animals, finding themselves in a genial climate, have increased and multiplied?
The numerous little animals of the species which I have always considered to be the Velella of Lamarck went sailing merrily by us today; the least breath of wind made them turn round and round; and this was their mode of progression, the animal moved its little sail which I have before mentioned, and worked its tentaculae so vigorously as to make ripples in the water, in the midst of which it went buoyantly floating along.
Caught another fish (Stenopteryx Illustration 5) of the same species as that found on the 15th of July.