Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 12
... tubes are strongly branched ( see Fig . 8 ) , although they likewise all eventually terminate in a single circular tube . This circular or marginal tube in both cases communi- Lates by minute apertures with the external medium . The ...
... tubes are strongly branched ( see Fig . 8 ) , although they likewise all eventually terminate in a single circular tube . This circular or marginal tube in both cases communi- Lates by minute apertures with the external medium . The ...
Pagina 11
... tube - system , which radiates through the lower or concave aspect of the umbrella . This tube - system , which serves to convey digested ma- terial and may therefore be regarded as intestinal in function , presents two different forms ...
... tube - system , which radiates through the lower or concave aspect of the umbrella . This tube - system , which serves to convey digested ma- terial and may therefore be regarded as intestinal in function , presents two different forms ...
Pagina 12
... tubes are strongly branched ( see Fig . 8 ) , although they likewise all eventually terminate in a single circular tube . This circular or marginal tube in both cases communi- Lates by minute apertures with the external medium . The ...
... tubes are strongly branched ( see Fig . 8 ) , although they likewise all eventually terminate in a single circular tube . This circular or marginal tube in both cases communi- Lates by minute apertures with the external medium . The ...
Pagina 14
... forming a continuous circle all round the margin of the umbrella , following the course of the radial or nutrient tubes throughout their entire length , and proceeding also to the ten- 14 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... forming a continuous circle all round the margin of the umbrella , following the course of the radial or nutrient tubes throughout their entire length , and proceeding also to the ten- 14 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 29
... tube , this open tube continues its rhythmical contractions for an indefinitely long time , notwithstanding that the organism so mutilated is , of course , unable to pro- gress . Thus it is a matter of no consequence how small or how ...
... tube , this open tube continues its rhythmical contractions for an indefinitely long time , notwithstanding that the organism so mutilated is , of course , unable to pro- gress . Thus it is a matter of no consequence how small or how ...
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