Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 11
... portion of the animal . The manubrium , like the umbrella , varies much in size and shape in different species , as a glance at any figures of these animals will show . Both the manubrium and umbrella are almost entirely composed of a ...
... portion of the animal . The manubrium , like the umbrella , varies much in size and shape in different species , as a glance at any figures of these animals will show . Both the manubrium and umbrella are almost entirely composed of a ...
Pagina 18
... portion it is easy to tell from which ring the portion has been taken . That is to say , in the lower nerve- ring there are numerous nerve - fibres of considerable thickness , which contrast in a striking manner with the almost ...
... portion it is easy to tell from which ring the portion has been taken . That is to say , in the lower nerve- ring there are numerous nerve - fibres of considerable thickness , which contrast in a striking manner with the almost ...
Pagina 26
... 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 itself mainly constituted of thick trans ...
... 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 itself mainly constituted of thick trans ...
Pagina 28
... portion which has just been removed from its margin is as striking a contrast as it is possible to conceive . Hence it is not surprising that if the margin be left in situ , while other portions of the swimming - bell are mutilated to ...
... portion which has just been removed from its margin is as striking a contrast as it is possible to conceive . Hence it is not surprising that if the margin be left in situ , while other portions of the swimming - bell are mutilated to ...
Pagina 29
... portion of contractile tissue is left adhering to the severed margin of the swim- ming - bell ; for whether this portion be large or small , the locomotor centres contained in the margin are alike sufficient to supply the stimulus to ...
... portion of contractile tissue is left adhering to the severed margin of the swim- ming - bell ; for whether this portion be large or small , the locomotor centres contained in the margin are alike sufficient to supply the stimulus to ...
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