. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. HOW ANIMALS MOVE. 161 of flight, as Bats, by means of long-webbed fingers; Fly- ing Fishes, by large pectoral fins. Flying Eeptiles, Flying Squirrels, and the like, have a membrane stretched on the long ribs, or connecting the fore and hind limbs, which they use as a parachute, enabling them to take very long leaps. (3) Locomotion on Solids. — This requires less muscular effort than swimming or flying. The more unyielding the basis of support, the greater
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. HOW ANIMALS MOVE. 161 of flight, as Bats, by means of long-webbed fingers; Fly- ing Fishes, by large pectoral fins. Flying Eeptiles, Flying Squirrels, and the like, have a membrane stretched on the long ribs, or connecting the fore and hind limbs, which they use as a parachute, enabling them to take very long leaps. (3) Locomotion on Solids. — This requires less muscular effort than swimming or flying. The more unyielding the basis of support, the greater the amount of force left to move the animal along. The simplest method is the suctorial, the animal attaching itself to some fixed object, and then, by contraction, dragging the body onward. But the higher and more common method is by the use of bones, or other hard parts, as levers. The Star-fish creeps by the working of hundreds of tubular suckers, which are extended by being filled with. Fig. 126.—Diagrammatic section of Star-fish: a, mouth ; b, stomach; c, hepatic cae- cum ; d, dorsal or aboral surface; e, ambulacral plates; /, ovary ; gy tubular feet; A, internal sacs for extending the feet. fluid forced into them by little sacs. The Clam moves by fixing and contracting a muscular appendage, called a "; The Snail has innumerable short muscles on the under side of its body, which, by successive contrac- tions, resembling minute undulations, enable the animal to glide forward apparently without effort. The Leech has a sucker at each end: fixing itself by the one on its tail, and then stretching the body, by contracting the mus- cular fibres which run around it, the creature fastens its mouth by suction, and draws forward the hinder parts by 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original w
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
