United States or Haiti ? Vote for the TOP Country of the Week !
The date-mussels play an important part in the conversion of sea-contained minerals into dry land. Massive blocks of lime secreted by coral polyps being weakened by the tunnels of the mussels are the more easily broken by wave force; and being reduced finally to mud, the lime, in association with sand and other constituents, forms solid rock.
The modern Coral animals are chiefly Polyps, but the prevailing Corals of the Silurian age were Acalephian Hydroids, animals which indeed resemble Polyps in certain external features, and have been mistaken for them, but which are nevertheless Acalephs by their internal structure; for, instead of having the vertical partitions dividing the body into chambers, so characteristic of the Polyps, they are divided by tubes corresponding to the radiating tubes of the Acalephs proper, these tubes being themselves divided at regular distances by horizontal floors, so that they never run uninterruptedly from top to bottom of the body.
On returning in an hour or two I found the starfish trying to make a meal of the largest anemone. Hundreds of dart-covered strings had been pushed out by the latter in defence, but they seemed to cause the starfish no inconvenience whatever. In my submarine glimpses I saw spaces free from seaweed on which hundreds of tall polyps were growing, some singly, others in small tufts.
A nation degraded is happy: if she has not the sentiment of liberty, neither has she the storms and disturbances which it begets; she lives as polyps live; she can be cut up into two or three pieces and each piece is still a nation, complete and living, and ready to be governed by the first blind man who arms himself with the pastoral staff.
These bud-like young afterwards become what are known as jelly-fishes, etc., which in turn reproduce themselves but here is a wonder the jelly-fish lay eggs, which when hatched produce stationary polyps like their grandparent, and not moving creatures like their parents. The jelly-fishes have a comparatively complex organism.
We find exquisitely delicate structures, some inhabited by simple hydra-like polyps, others by more organised kinds. On the leaves, also, various shells, uncovered molluscs, and bivalves are attached. Innumerable Crustacea frequent every part of the plant.
Soft polyps should be drawn out with a toothed tenaculum as far as can be without risk of breaking them off. The incision should be made at the root so that nothing or just as little as possible of the pathological structure be allowed to remain.
In tropical waters many of them have fascinating colors and patterns. By simulating the colors of the coral polyps they escape the species that prey upon them. The different kinds of coral are generally designated by common names according to the different objects which they resemble. Thus, by similarity of form we have brain coral, organ-pipe coral, mushroom coral, staghorn coral, etc.
The carnivorous spray and bloom of the deep-sea flowers amid which drowned men's "bones are coral made" seem of one temperament with the polyps as they slowly, slowly wave their tendrils and petals; but there is amusement if not pleasure in store for the traveller who turns from them to the company of shad softly and continuously circling in their tank, and regarding the spectators with a surly dignity becoming to people in better society than others.
"You see that bed of pink flowers over there, and those green rushes, and those fern-like plants? Well, they are all living polyps, or colonies of polyps, some kinds of which leave coral when they die, like the coral polyps proper. "As for the Anemones; those innocent looking flowers really possess powerful weapons in the shape of tiny lassos, which are concealed in lasso-cells.
Word Of The Day