Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 21
Pagina 258
... tube - feet is provided in its membraneous walls with a number of. Fig . 35. The terminal portion of a tube - foot ( magnified ) . Fig . 40. Showing interior of Echinus shell . (. 258 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... tube - feet is provided in its membraneous walls with a number of. Fig . 35. The terminal portion of a tube - foot ( magnified ) . Fig . 40. Showing interior of Echinus shell . (. 258 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 267
... Echinus . It would only be necessary to add the curious apparatus of teeth ( Figs . 40 and 42 ) , which occurs in the Echinus , to increase the size of the spines and pedicellariæ , and to make a few other such minor alterations ; but ...
... Echinus . It would only be necessary to add the curious apparatus of teeth ( Figs . 40 and 42 ) , which occurs in the Echinus , to increase the size of the spines and pedicellariæ , and to make a few other such minor alterations ; but ...
Pagina 272
... Echinus may either ascend it or not , as in the case of the Star - fish . While walking , the animal keeps pretty persistently in one direction of advance . If it be partly rotated by the hand , it does not continue in the same ...
... Echinus may either ascend it or not , as in the case of the Star - fish . While walking , the animal keeps pretty persistently in one direction of advance . If it be partly rotated by the hand , it does not continue in the same ...
Pagina 278
... . 51 . available can be at once appreciated on witnessing the performance. this position by means of the slender motive power Fig . 53. External nerve - plexus of Echinus . 278 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... . 51 . available can be at once appreciated on witnessing the performance. this position by means of the slender motive power Fig . 53. External nerve - plexus of Echinus . 278 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 279
... Echinus , after rearing up a certain height , becoming exhausted and again falling back upon its ab - oral pole . Moreover , in some cases it is interesting to observe that when the equator position has been reached with difficulty ...
... Echinus , after rearing up a certain height , becoming exhausted and again falling back upon its ab - oral pole . Moreover , in some cases it is interesting to observe that when the equator position has been reached with difficulty ...
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