IS nKCIIEHCIIRS SllH I.KS CIUSTACES 



l:cs iiiouvcMiciils (jircrrcclnciil, Ics l\iic(''('s dniis I'licic rcspiraloire soul 



Iroinri' ;. r.iis..; <■<.,. y \Vt si-ii.ilr luiil a rii.Mirc, la |.irnii('n> (.ain' dc 



pallcs irs((' iniinohilc; la sccoiidc el la Iroisirnic, oriiaiics aclifs dii loiirhil- 



loim.'niri.(,cx(r ii( drs nicuvrmciils oscillaloinvs rapidcs d avaiil m ariirn' ; 



Irs |)all('s vcsicdliloniics dcs dnix pain-s posU'ricuirs, rxchisiv^'iiiciil r.-spi- 

 raU.iivs, iroscillciil pas; iiiais, m-cvaiil a ci^'Mpir syslolc dii ('(.Mir ium' oiidn' 



saii-iiinc (oi.si(l(Tald(' (pii Ics koiiH*', -dies sVlr\ I el s'ahaissnil, (rune 



niaiijnr rli,MliMii(pi('. 



Aitisi (pic jc Tai d('ja dil, MuUov rc-anlail, la picininc paiiv dc pallcs 



dos ImkV'cs c riic III! (Mciir vciilral a cause dcs piilsalidiis (pi'il y a\ail 



ol)scrv(M"s cl d , fai c-alciiiciil, coiislalc la prcsciic(> clic/, Ics -raiidcs 



cspcccs; (vs p.dsa(i..ns s<.iil, sin.plcin.Mil dues au c(MiraNl, sau^uii. I>rau(diial; 

 cc c.uranl ny csl pas coushicrahlc , mais sc voil, racih'niciil, par suilc dc la 



:i. Api'iirnI rirnila/oirr.-^ Kc cdMir, sihic uii pcu cii an-icrc du prolon- 

 g'cmciii pnsl<Ti<'ur cl, sup(''ficur tie la \v\r , csl, couscjiucnuucul Idcii plus 

 i-cpuilc vcis Ic iiiihVu (!<' la l,.ii-.i(>ur du corps (pic c|,cz Ics daphuics, mais 

 noii (pi," chcz Ics daplniics (pii viciiiiciiL iU' iiailic, ou jc liii ai vu (iccuper la 

 lucinc poMlioii. 



Lc co'ur cs! scpaiY' par lui clraiii-lcuK'ul laiblc tpii Ic divisc en deux 

 jjaiiicsa pen pres ("irales; la p(»slcricurc poiirrail cire iioiniiK-c orcillcile cl 

 Faiilcricuiv vciilricule. Ceile division du co'ur avail dcja cic si-iialcc par 

 Scliaeircr die/ Ics da|diiucs; Siraus iic radiiie! pas ', mais (iruilliniscii '■ I'a 

 dcmonlrcc posilivcmciil dans mi memoire Ircs-inicrcssaiil sur la rirculalioii 

 dc la l). snua. 



Ni Sliaus iii (iruilliuis.'ii iie dccrivciil dc sinus Nciiicux ou dc p(M-lic 

 aulour du c(nir dcs daphnics; la presence dc cellc cnvelopp.' passive du 

 cic.ur cliez Ics cruslaces dcs i^ioiipcs plus ejeves pcrmcllail dc siipposer son 



