Half hours with the lower animals : $b protozoans, sponges, corals, shells, insects, and crustaceansHolder, Charles Frederick
Science
Half hours with the lower animals : $b protozoans, sponges, corals, shells, insects, and crustaceans
Holder, Charles Frederick
Animals; Invertebrates
Beneath almost every rock along the New England coast, and under the
branch coral in the tropics, we may find a typical star-shaped animal,
and by dredging offshore, thousands are brought up, even from very
deep water, showing that the stars of the sea are almost as plentiful
as they appear in the sky above. These starfishes are of all shapes,
kinds, and colors. Some are a foot or more across, huge, domed
fellows with rough backs, showing little if any signs of life (Fig.
48); others have five long legs and a small body (Fig. 49). Others,
again, are perfectly round and have many rays, while some have few
rays which are round, like the body of a snake, and which they whip
and slash about, displaying great activity. Once in reaching beneath
a coral branch to find a certain shell which I knew lived there, my
hand grasped something which felt like a ball of snakes, each of
which closed about it, producing a most disagreeable sensation. I
drew it out and found it was one of the starfishes, common on many
shores as the basket starfish (Fig. 47). As I lifted it up it was a
veritable mass of coiling arms, a Medusa's head of the sea, coiling and
uncoiling. It was merely a starfish in which each arm branches in two
parts, each branching out into two again with the result pictured, a
confused mass of arms. As I lifted my capture above water and it felt
the air it began to shed its arms, so that it fairly rained pieces of
starfish, and before I reached the boat, but a few feet away, all that
remained was the body. My starfish had almost committed suicide.
[Illustration: FIG. 49.--A deep-water starfish (_Ophiocoma_), a rapid
mover.]
The starfishes are found everywhere in the tropics. Every bunch of
coral contains scores of them. Many resemble spiders, and are a vivid
red hue, others are bronze or brick red, while still others are barred
or spotted, as in Figure 50. They are all interesting creatures,
especially our common Eastern starfish, which is found in little caves
at low tide, clinging to the walls. It is not very attractive in
appearance, and apparently not disconcerted by being left by the tide.
[Illustration: FIG. 50.--A brittle starfish.]
If we take a common starfish and turn it upon its back, we observe that
the lower portion is covered with short tentacles, each having a little
sucker on the end. These are the feet of the starfish, by which it
walks or moves. In the center of the body is the mouth leading into the
stomach which reaches into each ray. The eyes are at the tip of each
ray. On the back of the star we find a little red disk with a rough
surface. This is really a sieve for straining the water which pours in
through a little canal encircling the mouth and leading off into each
arm, carrying water to each one of the myriads of feet.
Public-domain text, read in full here on John Shaqi.
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