Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 26
... nectocalyx . In each case alike this portion of the animal performs the office of locomotion , and it does so in the same way . I have already said that this mushroom - like organ , which constitutes the main bulk of the animal , is ...
... nectocalyx . In each case alike this portion of the animal performs the office of locomotion , and it does so in the same way . I have already said that this mushroom - like organ , which constitutes the main bulk of the animal , is ...
Pagina 27
... nectocalyx causes immediate , total , and permanent paralysis of the entire organ . Nothing can possibly be more definite than in this highly remarkable effect . I have made hundreds of observations upon various species of the naked ...
... nectocalyx causes immediate , total , and permanent paralysis of the entire organ . Nothing can possibly be more definite than in this highly remarkable effect . I have made hundreds of observations upon various species of the naked ...
Pagina 28
... nectocalyx , under ordinary circumstances , are exclusively due . And this obvious deduction is confirmed ( if it can be conceived to require confirmation ) by the behaviour of the severed margin . This continues its rhyth- mical ...
... nectocalyx , under ordinary circumstances , are exclusively due . And this obvious deduction is confirmed ( if it can be conceived to require confirmation ) by the behaviour of the severed margin . This continues its rhyth- mical ...
Pagina 33
... nectocalyx , but that there is a greater supply of such centres in the marginal bodies than elsewhere . Effects of excising Certain Portions of the Margin of Umbrellas . Coming now to the covered - eyed Medusæ , I find that the ...
... nectocalyx , but that there is a greater supply of such centres in the marginal bodies than elsewhere . Effects of excising Certain Portions of the Margin of Umbrellas . Coming now to the covered - eyed Medusæ , I find that the ...
Pagina 34
... Nectocalyx or Umbrella . Lastly , it must now be stated , and always borne in mind , that neither in the case of naked nor covered eyed Medusæ does excision of the margin of a swimming organ produce the smallest effect upon the ...
... Nectocalyx or Umbrella . Lastly , it must now be stated , and always borne in mind , that neither in the case of naked nor covered eyed Medusæ does excision of the margin of a swimming organ produce the smallest effect upon the ...
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