Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 3
... surface fauna , or steaming 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 ...
... surface fauna , or steaming 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 ...
Pagina 4
... surface fauna , or steaming 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 ...
... surface fauna , or steaming 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 ...
Pagina 11
... surface of the manubrium and the whole concave surface of the umbrella are overlayed by a thin layer or sheet of contractile tissue . This tissue constitutes the earliest appearance in the animal kingdom of true muscular fibres , and ...
... surface of the manubrium and the whole concave surface of the umbrella are overlayed by a thin layer or sheet of contractile tissue . This tissue constitutes the earliest appearance in the animal kingdom of true muscular fibres , and ...
Pagina 17
... epithelium cells . The first kind are of a long and cylindrical form , the free ends of which reach as far as the upper surface of the epithelium The second kind lie for the most part under the STRUCTURE OF THE MEDUSA . 17.
... epithelium cells . The first kind are of a long and cylindrical form , the free ends of which reach as far as the upper surface of the epithelium The second kind lie for the most part under the STRUCTURE OF THE MEDUSA . 17.
Pagina 18
... surface , a long continuation , which at its free extremity supports a hair . In some cases this continuation is smaller , and stops short before reaching the outer surface . Drs . Hertwig observe that in these peculiar cells we have ...
... surface , a long continuation , which at its free extremity supports a hair . In some cases this continuation is smaller , and stops short before reaching the outer surface . Drs . Hertwig observe that in these peculiar cells we have ...
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