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A few days after, a Crab, of the size of a dime, died. Nat soon learned the fact, and enveloped the crustacean as he had done the mollusk. Thirty hours sufficed to drill through the Crab's foundation-wall, and to abstract the unguarded treasure. Every week some rifled Trivittatum tells a new tale of his felonious deeds.
It may be said in opposition to the view that the insects came originally from the same early crustacean resembling the larva of a crab or shrimp, that the differences between the two types are too great, or, in other words, the homologies of the two classes too remote, and the two types are each too specialized to lead us to suppose that one was derived from the other.
In most cases, however, the larvæ, though active, still obey, more or less closely, the law of common embryonic resemblance. Cirripedes afford a good instance of this: even the illustrious Cuvier did not perceive that a barnacle was, as it certainly is, a crustacean; but a glance at the larva shows this to be the case in an unmistakeable manner.
On the coast also the Raven seeks to obtain possession of the Hermit-crab. This Crustacean dwells in the empty shells of Gasteropods. At the least alarm he retires within this shell and becomes invisible, but the bird advances with so much precaution that he is often able to seize the crab before he has time to hide himself.
Recovering slowly from its fright, and conscious of the necessity for each detail of its equipment and insignia, the lowly crustacean timidly re-grips the coral, and holding it aloft, glides discreetly on its way, invisible when stationary, most difficult to detect when it moves. To see the coral garden to advantage you must pass over it not through it.
Why should similar bones have been created in the formation of the wing and leg of a bat, used as they are for such totally different purposes? Why should one crustacean, which has an extremely complex mouth formed of many parts, consequently always have fewer legs; or conversely, those with many legs have simpler mouths?
For instance, I cannot doubt that all the Silurian trilobites have descended from some one crustacean, which must have lived long before the Silurian age, and which probably differed greatly from any known animal.
This Crustacean lives on the earth, at a distance of about ten or twelve kilometres from the sea-shore, and nourishes itself on animal and vegetable remains. It approaches the water only at the period of laying eggs, turning towards the coast in the months of February and March.
They were of use in swimming, and sections of them were stiffened with rods of cartilage, and became the pairs of fins. Some experts think, however, that the fish developed directly from a Crustacean, and hold that the Ostracoderms are the connecting link. Directly or indirectly, the fish is a descendant of some Archaean Annelid. It is most probable that the shark was the first true fish-type.
I can afford to be forgotten. Look here! he said. I keep oblivion always before me. -He pointed to a singularly perfect and beautiful trilobite which was lying on a pile of manuscripts. -Each time I fill a sheet of paper with what I am writing, I lay it beneath this relic of a dead world, and project my thought forward into eternity as far as this extinct crustacean carries it backward.
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