Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 4
... completely different in the two classes , and that in the case of each class the plan or mechanism is unique , i.e. is not to be met with elsewhere in the animal kingdom . It is curious , however , that , in the case of one family of ...
... completely different in the two classes , and that in the case of each class the plan or mechanism is unique , i.e. is not to be met with elsewhere in the animal kingdom . It is curious , however , that , in the case of one family of ...
Pagina 28
... , the spontaneity of the animal is not at all interfered with . For instance , if the equator of any individual belonging to the genus Sarsia ( Fig . 1 ) be cut completely 28 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... , the spontaneity of the animal is not at all interfered with . For instance , if the equator of any individual belonging to the genus Sarsia ( Fig . 1 ) be cut completely 28 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 29
George John Romanes. genus Sarsia ( Fig . 1 ) be cut completely through , so that the swimming - bell instead of being closed at the top is converted into an open tube , this open tube continues its rhythmical contractions for an ...
George John Romanes. genus Sarsia ( Fig . 1 ) be cut completely through , so that the swimming - bell instead of being closed at the top is converted into an open tube , this open tube continues its rhythmical contractions for an ...
Pagina 41
... completely shut out the daylight from the room in which the jar was placed . By means of a dark lantern and a concentrating lens , I then cast a beam of light through the water in which the Sarsia were swimming . The effect upon the ...
... completely shut out the daylight from the room in which the jar was placed . By means of a dark lantern and a concentrating lens , I then cast a beam of light through the water in which the Sarsia were swimming . The effect upon the ...
Pagina 61
... completely beyond the power of the will . Lastly , I may further observe , what I do not think has ever been observed before , that even in the domain of psychology the action of this principle admits of being clearly traced . We find ...
... completely beyond the power of the will . Lastly , I may further observe , what I do not think has ever been observed before , that even in the domain of psychology the action of this principle admits of being clearly traced . We find ...
Termeni și expresii frecvente
able ambulacral feet artificial rhythm Aurelia aurita become bell blocked brium cause ceased chloroform co-ordination continue contractile strip contractile tissue contraction contraction-waves covered-eyed Medusa crawling curare diastole direction discharge Echinoderm Echinodermata Echinus effect excising excitable tissues experiments fact feeble fibres forceps fresh water function ganglionic glycerine hour Illustrations induction shocks influence instance intervals irritability jelly-fish latter lithocyst locomotor centres manubrium marginal bodies marginal ganglia minutes movements muscle muscular mutilated naked-eyed Medusa natural rhythm nectocalyx nerve nerve-cells nerve-centre nerve-fibres nerve-ring nerve-trunks nervous network nervous system normal sea-water observed occur organ paralyzed pass pedicellariæ pedicels period of latent physiological plexus poison portion prepotent Professor pulsations radial tubes rays reflex reflex action removed response Sarsia seconds segments spasm species specimens spines spontaneity Star-fish strychnia suckers surface swimming motions swimming-bell systole tank temperature tentacles tentacular tetanus Tiaropsis indicans tion umbrella unmutilated animal wave whole