Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 14
... as forming a 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 .
... as forming a 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
George John Romanes. their entire length , and proceeding also to the ten- tacles and marginal bodies . At the base of each tentacle there is a ganglionic swelling , and it is from these ganglionic swellings that the nerves just ...
George John Romanes. their entire length , and proceeding also to the ten- tacles and marginal bodies . At the base of each tentacle there is a ganglionic swelling , and it is from these ganglionic swellings that the nerves just ...
Pagina 26
... consisting merely of an alternate contraction and relaxation of the entire muscular sheet which lines the cavity of the bell . At each contraction of this muscular sheet the gelatinous walls of the bell are drawn together ; the capacity.
... consisting merely of an alternate contraction and relaxation of the entire muscular sheet which lines the cavity of the bell . At each contraction of this muscular sheet the gelatinous walls of the bell are drawn together ; the capacity.
Pagina 27
... entire Margins of Nectocalyces . Confining our attention under this heading to the naked - eyed Medusa , I find that the following proposition applies to every species of the group which I have as yet had the opportunity of ex- amining ...
... entire Margins of Nectocalyces . Confining our attention under this heading to the naked - eyed Medusa , I find that the following proposition applies to every species of the group which I have as yet had the opportunity of ex- amining ...
Pagina 29
... entire Margins of Umbrellas . Turning now to the covered - eyed division of the Medusæ , I find , in all the species I have come across , that excision of the margins of umbrellas produces an effect analogous to that which is produced ...
... entire Margins of Umbrellas . Turning now to the covered - eyed division of the Medusæ , I find , in all the species I have come across , that excision of the margins of umbrellas produces an effect analogous to that which is produced ...
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