Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 14
Pagina 270
... ( Fig . 46 ) ; at each stroke the animal advances with a leap or bound about the distance of. Fig . 45. - The same , showing the Fig . 47. - Natural righting movements of common Star. 270 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... ( Fig . 46 ) ; at each stroke the animal advances with a leap or bound about the distance of. Fig . 45. - The same , showing the Fig . 47. - Natural righting movements of common Star. 270 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 274
... righting movements of common Star - fish . Fig . 48. - Righting movements of Astropecten . 274 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... righting movements of common Star - fish . Fig . 48. - Righting movements of Astropecten . 274 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 281
... a marked tendency to rotate always in the same direction , or to use the same set of foot - rows for the purpose of righting themselves . In these individual specimens , therefore , we must conclude STAR - FISH AND SEA - URCHINS . 281.
... a marked tendency to rotate always in the same direction , or to use the same set of foot - rows for the purpose of righting themselves . In these individual specimens , therefore , we must conclude STAR - FISH AND SEA - URCHINS . 281.
Pagina 295
... righting itself . This movement Fig . 56. Movements performed by a detached ray of a Star - fish , in which the then continues as far as the line of nerve - injury , where it invariably stops ( Fig . 56 ) . The central portion may then ...
... righting itself . This movement Fig . 56. Movements performed by a detached ray of a Star - fish , in which the then continues as far as the line of nerve - injury , where it invariably stops ( Fig . 56 ) . The central portion may then ...
Pagina 296
... righting seems to be eventually effected by a mere accidental prepotency of some of the righting movements over others . Appended is a sketch of such un - coördinated movement , taken from a specimen which for more than an hour had been ...
... righting seems to be eventually effected by a mere accidental prepotency of some of the righting movements over others . Appended is a sketch of such un - coördinated movement , taken from a specimen which for more than an hour had been ...
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