Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 17
... the epithelium cells . The first kind are of a long and cylindrical form , the free ends of which reach as far as the upper surface of the epithelium The second kind lie for the most part under the STRUCTURE OF THE MEDUSA . 17.
... the epithelium cells . The first kind are of a long and cylindrical form , the free ends of which reach as far as the upper surface of the epithelium The second kind lie for the most part under the STRUCTURE OF THE MEDUSA . 17.
Pagina 18
George John Romanes. The second kind lie for the most part under the upper surface . They are of a large size , and pre- sent , coursing towards the upper surface , a long continuation , which at its free extremity supports a hair . In ...
George John Romanes. The second kind lie for the most part under the upper surface . They are of a large size , and pre- sent , coursing towards the upper surface , a long continuation , which at its free extremity supports a hair . In ...
Pagina 19
... second point of difference consists in the surprising wealth of ganglion - cells in the one ring as compared with the other . Thus , on the whole , there is no doubt that the lower nerve - ring presents a higher grade of structure than ...
... second point of difference consists in the surprising wealth of ganglion - cells in the one ring as compared with the other . Thus , on the whole , there is no doubt that the lower nerve - ring presents a higher grade of structure than ...
Pagina 30
... seconds to half an hour or more , occasional weak and unrhythmical contractions begin to mani- fest themselves , or the contractions may even be resumed with but little apparent change in their character and frequency . The condition of ...
... seconds to half an hour or more , occasional weak and unrhythmical contractions begin to mani- fest themselves , or the contractions may even be resumed with but little apparent change in their character and frequency . The condition of ...
Pagina 43
... luminous ; but in response to light , the characteristic spasm does not take place till slightly more than a second has elapsed after the first occurrence of the stimulus . As this extraordinary difference in EXPERIMENTS IN STIMULATION .
... luminous ; but in response to light , the characteristic spasm does not take place till slightly more than a second has elapsed after the first occurrence of the stimulus . As this extraordinary difference in EXPERIMENTS IN STIMULATION .
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