Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 11
... organ , occupy- ing the position of , and more or less resembling in form , the stalk of a mushroom . This organ is called the " manubrium , " on account of its looking like the " handle " of an umbrella , and the term " umbrella " is ...
... organ , occupy- ing the position of , and more or less resembling in form , the stalk of a mushroom . This organ is called the " manubrium , " on account of its looking like the " handle " of an umbrella , and the term " umbrella " is ...
Pagina 26
... organ , which constitutes the main bulk of the animal , is itself mainly constituted of thick trans- parent and non - contractile jelly , but that the whole of its concave surface is lined with a thin sheet of muscular tissue . Such ...
... organ , which constitutes the main bulk of the animal , is itself mainly constituted of thick trans- parent and non - contractile jelly , but that the whole of its concave surface is lined with a thin sheet of muscular tissue . Such ...
Pagina 27
... organ . Nothing can possibly be more definite than in this highly remarkable effect . I have made hundreds of observations upon various species of the naked - eyed Medusæ , of all ages and conditions of freshness , vigour , etc .; and I ...
... organ . Nothing can possibly be more definite than in this highly remarkable effect . I have made hundreds of observations upon various species of the naked - eyed Medusæ , of all ages and conditions of freshness , vigour , etc .; and I ...
Pagina 31
... organ , or situated only , or chiefly , in the so - called marginal 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 ...
... organ , or situated only , or chiefly , in the so - called marginal 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 ...
Pagina 32
... organ . From the fact , however , that excision of the entire margin of Sarsia produces total paralysis , while excision of the marginal bodies alone produces merely partial paralysis , there can be no doubt that both causes are ...
... organ . From the fact , however , that excision of the entire margin of Sarsia produces total paralysis , while excision of the marginal bodies alone produces merely partial paralysis , there can be no doubt that both causes are ...
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