Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 12
... minute apertures with the external medium . The margin of the umbrella , both in the naked and covered eyed Medusa , supports a series of con- tractile tentacles , which vary greatly in size and number in different species ( see Figs ...
... minute apertures with the external medium . The margin of the umbrella , both in the naked and covered eyed Medusa , supports a series of con- tractile tentacles , which vary greatly in size and number in different species ( see Figs ...
Pagina 12
... minute apertures with the external medium . The margin of the umbrella , both in the naked and covered eyed Medusa , supports a series of con- tractile tentacles , which vary greatly in size and number in different species ( see Figs ...
... minute apertures with the external medium . The margin of the umbrella , both in the naked and covered eyed Medusa , supports a series of con- tractile tentacles , which vary greatly in size and number in different species ( see Figs ...
Pagina 23
... minute nerve - cells and very minute nerve - fibres . The fibres proceed to and from the cells , so in some cases serving to unite the cells with one another , and in other cases with distant parts of the animal body . Nerve - cells are ...
... minute nerve - cells and very minute nerve - fibres . The fibres proceed to and from the cells , so in some cases serving to unite the cells with one another , and in other cases with distant parts of the animal body . Nerve - cells are ...
Pagina 28
... minute a portion of their substance is rendered by contrast the more surprising . From this experiment , therefore , I conclude that in the margin of all the species of naked - eyed Medusa which I have as yet had the opportunity of ...
... minute a portion of their substance is rendered by contrast the more surprising . From this experiment , therefore , I conclude that in the margin of all the species of naked - eyed Medusa which I have as yet had the opportunity of ...
Pagina 32
... minute a portion of the intertentacular marginal tissue is sufficient , in case of this genus , to animate the entire swimming - bell . Choosing vigorous * See Fig . 1 . specimens of Sarsia , I have tried , by cutting 32 JELLY - FISH ...
... minute a portion of the intertentacular marginal tissue is sufficient , in case of this genus , to animate the entire swimming - bell . Choosing vigorous * See Fig . 1 . specimens of Sarsia , I have tried , by cutting 32 JELLY - FISH ...
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