Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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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 15
... radial canals and marginal 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 ...
... radial canals and marginal 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 ...
Pagina 20
... radial canals , thus giving rise in these localities to what may be called nerve - trunks . But in other species no such aggregations are apparent , the nervous plexus spreading out in the form of an even trellis - work . In the covered ...
... radial canals , thus giving rise in these localities to what may be called nerve - trunks . But in other species no such aggregations are apparent , the nervous plexus spreading out in the form of an even trellis - work . In the covered ...
Pagina 47
... radial tubes . The external or convex surface of a nectocalyx or umbrella is totally insensitive to stimulation , and the same statement applies to the whole thickness of the gelatinous substance to which the neuro- muscular sheet is ...
... radial tubes . The external or convex surface of a nectocalyx or umbrella is totally insensitive to stimulation , and the same statement applies to the whole thickness of the gelatinous substance to which the neuro- muscular sheet is ...
Pagina 51
... radial direction , and close to the gap caused by the missing segment . The other , or free , end of this straw was firmly joined to a capillary glass rod , which was suit- ably bent to avoid contact with the rim of the basin , and also ...
... radial direction , and close to the gap caused by the missing segment . The other , or free , end of this straw was firmly joined to a capillary glass rod , which was suit- ably bent to avoid contact with the rim of the basin , and also ...
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