Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 3
... away far from shore to dredge for other material , or , again , carrying on observations in the cool sea - water tanks and bell - jars of a neat little wooden workshop thrown open to the sea- breezes , INTRODUCTION . 3.
... away far from shore to dredge for other material , or , again , carrying on observations in the cool sea - water tanks and bell - jars of a neat little wooden workshop thrown open to the sea- breezes , INTRODUCTION . 3.
Pagina 4
... away far from shore to dredge for other material , or , again , carrying on observations in the cool sea - water tanks and bell - jars of a neat little wooden workshop thrown open to the sea- breezes , INTRODUCTION . 3.
... away far from shore to dredge for other material , or , again , carrying on observations in the cool sea - water tanks and bell - jars of a neat little wooden workshop thrown open to the sea- breezes , INTRODUCTION . 3.
Pagina 16
... 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 flattish layer , which * This ...
... 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 flattish layer , which * This ...
Pagina 26
... bell , or nectocalyx . In each case alike this portion of the animal performs the office of locomotion , and it does ... bell . At each contraction of this muscular sheet the gelatinous walls of the bell are drawn together ; the capacity.
... bell , or nectocalyx . In each case alike this portion of the animal performs the office of locomotion , and it does ... bell . At each contraction of this muscular sheet the gelatinous walls of the bell are drawn together ; the capacity.
Pagina 27
... bell being thus diminished , water is ejected from the open mouth of the bell backwards , and the consequent reaction propels the animal forwards . In these swimming movements , systole and diastole follow one another with as perfect a ...
... bell being thus diminished , water is ejected from the open mouth of the bell backwards , and the consequent reaction propels the animal forwards . In these swimming movements , systole and diastole follow one another with as perfect a ...
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