74 



K. H. JI,ABHJI,0B1., 



Tohho TaKJKe H3i Ha6jiK)AeHifi Toro me aBTopa BbiTeKaerb, ito y 3apoAbiujeH B. kowa- 

 lewskii OTcyTCTByera stomodaeum, hjih, no KpaHHefi inipt, yqaciie 9KTOAepMM bt> o6pa3OBaei0 

 ero qpesBMianHO orpanaqeno. «The niouth», roBopnT'b 9T0i"b aBTopt: «is formed as a minute 

 pore, placed on the ventral surface in the groove which divides the proboscis from the 

 collar». (cTp. 212), a bt> Apyronn. m'ecte BbipajKaeTCH coBcfcMh onpeAEJieHHO: «it (t. e. porb) 

 open directly into the archenteron» (Bateson, 85, CTp. 81). 



TaKHM'b o6pa30M , b nponeccb pereHepaiiin coBepiueHHo cxoAeHT> bt> AaHHOMi, cjiyqat ct> 

 temt> npon,eccoMT>, KoropMn na6juoAaeTCH npa 9M6pioHajibHOMi pa3BHxin Enteropneusta, He 

 npeTcpnLBaiomRxi ooiKHaro MeTaiuop<i>03a. 



HacKOJibKO nocji-BAHiw npoueccb THnnqeH-b — mm He mojkcmt. cyABTb ao texi nopi, noKa 

 He CA'fejiaioTcn n3BtcTHbiMH nepBbie nponeccbi pa3BHTia rfexT> Enteropneusta, bi uhk.it> pa3- 

 BHTin KOTopbixi. bxoahtt> Tomaria. 



HoTOxop,n;a. 



npH 3M6pionajibHOMT> pa3BHTin, t. Ha3. HOTOxopAa o6pa3yeTCH nyTeMi BnasHBaHia BHyTpb 

 xo6ora yqacTKa nnmeBOAa. Kt> TaKOMy 3aiUK)qeHiK) npHincjii> Ulnenrejib (Spengel, 93) 

 (CTp. 410). BnpoieMi., rJiaBHMMT, o6pa30Mi, 9to 3aKjnoseHie IllneHreJiH ocBOBbmajiocb na H3y- 

 HeHin OTHomenig MejKAy nnmeBOAOM-b h y»e c*opMHpoBaBineHCH hotoxopaoh y B3pocjiaro 

 HtHBOTHaro, t. e. 6mjio ihcto anpiopHMMT> ^peA^o.ao}KeHieM^. EAHHCTBeHHoe ua6jiK)Aenie, 

 KOTopoe cymecTByerb OTHocniejibHO o6pa30Banifl 9Toro opraHa, npHHaAJieacHTb MopraHy 

 (Morgan, 92), paCoTa Koroparo noHBHJiacb yace bo BpeMH neqaraHia MOHorpa*in Spengel'n 

 H ue Morjia 6biTb bt. hojihoh Mtpi; Hcnojib30Bana nocjitAHOMb. OnncaHie h pncyHKH Morgan'a 

 qpe3Bbiqaiuio yfifeAHTejbno roBopaT'b bi nojib3y 9HTOAepMa.ubHaro nponcxoHueHia hotoxopam. 



IIocjrfeAHflH o6pa3yeTCH, KaKi> h cjitAOBajio owHAaTb, nyTCMi> 9Barnnauin yqacTKa name- 

 BOAa na rpaHHn,t ch 9KTOAepMOH l ). 



Onncanie h bi oco6eHHOCTH npeBocxoAHbin pncyHOKi Moprana (fig. 40, PI. XXVI) He 

 ocTaBJifliorb coMH'fcHifl bt> nojHOMi cooTBETCTBin npoueccpBT> o6pa30BaHia hotoxopam npn 

 9M6pionajibHOMi, pa3BnTin h pereHepanjn. 



SKaGepHtiH annapaTi. 



ripoueccij 3anjiaAKH h AH**epeHHnpoBaHia JKao"epHMXT> MtmKOBi npn 3M6piona.ibHOMi pa3- 

 Bnxin Enteropneusta AOCTaToqHO xopoino mcjiiAOuawb. 



Mm HM'feeMT. Ha 3tott> cqerb paA^ HaSjuoAemH. 



y>Ke nepBMMT. H3ci'EA0BaTe.iiflM'b MeTaMop*03a Tornaria yAajiocb bmhchhte y MOJOAoro 

 Balanoglossus npoueccb 3a«JiaAKH JKaSepHbix* mejiee. 



1) «At the anterior end of the oesophagus in the 

 middle line an evagination of modified cells has taken 

 place... this lies very near to the external opening, but 



is without doubt formed from entoderm. This evagina- 

 tion is the first appearence of the notochord. (cTp. 423). 



