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Updated: May 25, 2025
The shrimp when in confinement becomes very tame, and readily exuviates. The process is frequent, the integument separates entire, and is almost colourless. In female crustaceans the roe is placed outside the shell to which it adheres. During the period of such adherence, the female crab, so far as observation goes, does not change its shell a marked provision of nature to preserve the spawn.
We killed them in thousands, and the stench from their crushed bodies almost drove us out of our minds, but other thousands quickly filled their places, and the crustaceans continued to pour down the hatches like black streams of evil-smelling water. But this visitation, dreadful though it was, eventually proved our salvation.
"It may be" I struggled against the conviction now strong upon me "it may be that within that metallic shell is an organic body, something soft animal, as there is within the horny carapace of the turtle, the nacreous valves of the oyster, the shells of the crustaceans it may be that even their inner surface is organic "
Like turtles, armadillos, sea urchins, and crustaceans, these fish are protected by armor plate that's neither chalky nor stony but actual bone. Sometimes this armor takes the shape of a solid triangle, sometimes that of a solid quadrangle.
Do these so graduate into crustaceans as to form anything like such an organic link that one could, by generation, come naturally from the other? I should say, NO, being instructed by your labors. Are they so rudimentary as to look like abortions or creatures derived from some inferior class, which have not yet by development reached the higher type of fish?
There are crustaceans at the opposite ends of the series, which have hardly a character in common; yet the species at both ends, from being plainly allied to others, and these to others, and so onwards, can be recognised as unequivocally belonging to this, and to no other class of the Articulata.
Most physiologists believe that the bones of the skull are homologous with that is correspond in number and in relative connexion with the elemental parts of a certain number of vertebrae. The anterior and posterior limbs in each member of the vertebrate and articulate classes are plainly homologous. We see the same law in comparing the wonderfully complex jaws and legs in crustaceans.
The oceanic Fauna is not a rich one; its hydrozoa do not admit of preservation; and the hard parts of its few kinds of molluscs and crustaceans and insects are mostly fragile.
Fossils from Victoria Colony, he agrees with the Government-surveyor in classing as of Lower Silurian or Llandovery age: that is, he takes for granted that when certain crustaceans and mollusks were living in Wales, certain similar crustaceans and mollusks were living in Australia. Yet the improbability of this assumption may be readily shown from Sir R. Murchison's own facts.
Analogous laws govern the construction of the mouths and limbs of crustaceans. So it is with the flowers of plants. Nothing can be more hopeless than to attempt to explain this similarity of pattern in members of the same class, by utility or by the doctrine of final causes.
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