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In the second stage, answering to the chrysalis stage of butterflies, they have six pairs of beautifully constructed natatory legs, a pair of magnificent compound eyes, and extremely complex antennae; but they have a closed and imperfect mouth, and cannot feed: their function at this stage is, to search out by their well-developed organs of sense, and to reach by their active powers of swimming, a proper place on which to become attached and to undergo their final metamorphosis.
The simple median eye appears earlier, and would therefore be more important than the compound paired eyes; the scale of the antennae in the Prawns would be more important than the flagellum; the maxillipedes of the Decapoda would be more important than the chelae and ambulatory feet, and the anterior six pairs of feet in the Isopoda, than the precisely similarly formed seventh pair; in the Amphipoda the most important of all organs would be the "micropylar apparatus," which disappears without leaving a trace soon after hatching; in Cyclops the setae of the tail would be more important than all the natatory feet; in the Cirripedia the posterior antennae, as to which we do not know what becomes of them, would be more important than the cirri, and so forth.
Brodbelt, on the air contained in the natatory bladder of the sword-fish, had led some naturalists to think, that within the tropics, in sea-fish, that organ must be filled with pure oxygen gas. Full of this idea, I was surprised at finding in the air-bladder of the flying-fish only 0.04 of oxygen to 0.94 of azote and 0.02 of carbonic acid.
His natatory powers appear to have no limit: at all events, he has been met with swimming about in open water full twenty miles from either ice or land. He has been often seen much further from shore, drifting upon masses of ice; but it is doubtful whether he cared much for the footing thus afforded him.
The castaway who could not swim was that peculiar hybrid, or tribrid, already described; who, for any characteristic he carried about him, might have been born either upon the banks of the Clyde, the Thames, or the Shannon! It was "Old Bill" who was deficient in natatory prowess Old Bill, the sailor.
The men possessed the rest. Before the said lodging of the ladies, that they might have their recreation, between the two first towers, on the outside, were placed the tiltyard, the barriers or lists for tournaments, the hippodrome or riding-court, the theatre or public playhouse, and natatory or place to swim in, with most admirable baths in three stages, situated above one another, well furnished with all necessary accommodation, and store of myrtle-water.
The myrmidons of Inspector Bucket, foot and horse, supplement those natatory representatives. So do the municipalities encroach upon and overspread the country, as it is eminently proper they should, seeing that to the charters so long ago exacted, and so long and so jealously guarded, by the towns, so much of the liberty enjoyed by English-speaking peoples is due.
Its carapace is but slightly compressed laterally and hairy, as in Sacculina purpurea; the adherent feet are of considerable size, and the natatory feet are wanting, as, in the adult animal, are the corresponding cirri. As I learn from Mr. Powell in the Mauritius. Eggs of Tetraclita porosa in segmentation, magnified 90 diam.
In the second stage, answering to the chrysalis stage of butterflies, they have six pairs of beautifully constructed natatory legs, a pair of magnificent compound eyes, and extremely complex antennæ; but they have a closed and imperfect mouth, and cannot feed: their function at this stage is, to search by their well-developed organs of sense, and to reach by their active powers of swimming, a proper place on which to become attached and to undergo their final metamorphosis.
In the Cyclopidae the posterior antennae have lost their secondary branch, and the mandibles have completely thrown off the previously existing natatory feet, whilst in the other families these appendages persist, more or less altered.
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