Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 12
... margin of the umbrella , where they open into a common circular tube which runs all the way round the margin ( see Figs . 1 and 22 ) . In the " covered - eyed " group , on the other hand , the tubes are strongly branched ( see Fig . 8 ) ...
... margin of the umbrella , where they open into a common circular tube which runs all the way round the margin ( see Figs . 1 and 22 ) . In the " covered - eyed " group , on the other hand , the tubes are strongly branched ( see Fig . 8 ) ...
Pagina 12
... margin of the umbrella , where they open into a common circular tube which runs all the way round the margin ( see Figs . 1 and 22 ) . In the " covered - eyed " group , on the other hand , the tubes are strongly branched ( see Fig . 8 ) ...
... margin of the umbrella , where they open into a common circular tube which runs all the way round the margin ( see Figs . 1 and 22 ) . In the " covered - eyed " group , on the other hand , the tubes are strongly branched ( see Fig . 8 ) ...
Pagina 14
... continuous circle all round the margin of the umbrella , following the course of the radial or nutrient tubes throughout their entire length , and proceeding also to the ten- 14 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... continuous circle all round the margin of the umbrella , following the course of the radial or nutrient tubes throughout their entire length , and proceeding also to the ten- 14 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 16
... margin of the swimming - bell , and there forms a " nerve - ring , " which is divided by the insertion of the " veil " * into an upper and a lower nerve - ring . In many species the upper nerve - ring is spread out in the form of a ...
... margin of the swimming - bell , and there forms a " nerve - ring , " which is divided by the insertion of the " veil " * into an upper and a lower nerve - ring . In many species the upper nerve - ring is spread out in the form of a ...
Pagina 19
... neighbouring ganglion - cells in the plexus either coalesce or dwindle in their course to small fibres : at the margin of the umbrella these unite themselves with the elements of the nerve- rings . STRUCTURE OF THE MEDUSE . 19.
... neighbouring ganglion - cells in the plexus either coalesce or dwindle in their course to small fibres : at the margin of the umbrella these unite themselves with the elements of the nerve- rings . STRUCTURE OF THE MEDUSE . 19.
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