Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 17
... marked off from the surrounding tissues . But in other species the crowding together of the nerve - fibres at the insertion of the veil gives rise to a considerable concentration of nervous structures ; while in others , again , this ...
... marked off from the surrounding tissues . But in other species the crowding together of the nerve - fibres at the insertion of the veil gives rise to a considerable concentration of nervous structures ; while in others , again , this ...
Pagina 30
... marked as that which follows such mutilation of a swimming - bell , the paralysis of the former differs from the paralysis of the latter , in that it is very seldom permanent . After periods varying from a few seconds to half an hour or ...
... marked as that which follows such mutilation of a swimming - bell , the paralysis of the former differs from the paralysis of the latter , in that it is very seldom permanent . After periods varying from a few seconds to half an hour or ...
Pagina 39
... marked and unfailing . In the case of Sarsia , for instance , a flash of light let fall upon a living specimen almost invariably causes it to respond with one or more contractions . If the animal is vigorous and swimming freely in water ...
... marked and unfailing . In the case of Sarsia , for instance , a flash of light let fall upon a living specimen almost invariably causes it to respond with one or more contractions . If the animal is vigorous and swimming freely in water ...
Pagina 42
... marked . The three individuals which still had their marginal bodies sought the light as before , while the nine without their marginal bodies swam hither and thither , without paying it any regard . A further question , however , still ...
... marked . The three individuals which still had their marginal bodies sought the light as before , while the nine without their marginal bodies swam hither and thither , without paying it any regard . A further question , however , still ...
Pagina 43
... marked and decided than that which is given by Sarsia ; for a sudden exposure to sun- light causes this animal to go into a kind of tonic spasm , the whole of the nectocalyx being drawn together in a manner resembling cramp . Now , in ...
... marked and decided than that which is given by Sarsia ; for a sudden exposure to sun- light causes this animal to go into a kind of tonic spasm , the whole of the nectocalyx being drawn together in a manner resembling cramp . Now , in ...
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