Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 12
... bodies which will presently be found to be of much importance for us . These are the so - called " marginal bodies , " which vary in number , size , and structure in different species . In all the covered - eyed species these marginal ...
... bodies which will presently be found to be of much importance for us . These are the so - called " marginal bodies , " which vary in number , size , and structure in different species . In all the covered - eyed species these marginal ...
Pagina 12
... bodies which will presently be found to be of much importance for us . These are the so - called " marginal bodies , " which vary in number , size , and structure in different species . In all the covered - eyed species these marginal ...
... bodies which will presently be found to be of much importance for us . These are the so - called " marginal bodies , " which vary in number , size , and structure in different species . In all the covered - eyed species these marginal ...
Pagina 15
... bodies , while the least con- spicuous are those that proceed to the tentacles . Cells , as a rule , can only be observed in the gan- glionic swellings , where they appear as fusiform and distinctly nucleated bodies of great ...
... bodies , while the least con- spicuous are those that proceed to the tentacles . Cells , as a rule , can only be observed in the gan- glionic swellings , where they appear as fusiform and distinctly nucleated bodies of great ...
Pagina 21
... bodies present a peculiar modification of epithelium tissue , which is on its way , so to speak , towards becoming fully differentiated into ganglionic cells . Lastly , returning to the researches of Drs . Hert- wig , these authors ...
... bodies present a peculiar modification of epithelium tissue , which is on its way , so to speak , towards becoming fully differentiated into ganglionic cells . Lastly , returning to the researches of Drs . Hert- wig , these authors ...
Pagina 31
... bodies . To take the case of the naked- eyed Medusæ first , it is evident that in most of the genera , in consequence of the intertentacular spaces being so small , it is impossible to cut out the marginal bodies ( which are situated at ...
... bodies . To take the case of the naked- eyed Medusæ first , it is evident that in most of the genera , in consequence of the intertentacular spaces being so small , it is impossible to cut out the marginal bodies ( which are situated at ...
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