— 34 — 



TOJiBKO Ha;i'L uiejieBBfl^uuwh iieHTpajiBHeM'^ KanajioMt, ho h 6jiHace 

 Kt óoKaMi., KaKŁ 3T0 fl Haójiio^iajit na iionepeqHŁixi, pa3pi3ax'L 

 BMÓpioHa B-b 1,5 mm. ;tJiHHOM. 



TaKHMt o6pa30Mi>, ocHOBiiua jtannua KacaTejimo pasBHTia 

 HepBOBTj y Cyclostomi Haxo;i,aTca bi^ nojiHOMi. eor.iacin cl t-Łmi., 

 UTO paHbme npeACTaB-ieno jtJia Selachii. 



^.T0 KacaeTca kocthctłiki. pHo^L, to no3ji.n'tHmiii H3CJi'fejto- 

 BaTejiŁ Bt aToi o6jiacTn, TenHerH (24), iioji.TBepjK;i.aeTTb Btoó- 

 meMi. HaÓJHOjnenia Bajib*ypa, MapiiiajiJia (nepBtia) m Bt 

 ocooeHBOCTM F * * M a H a (1. c. p. 548). Tujilko OHt, no BceMy B'fe- 

 poflTiio, omaóo^HO c^MraeTi, nepBEJM'L noasjiCHie cjiyxoBaro Hep- 

 Ba HJiH no Kpainei M-fepife ero raHraia. 



Ckojibko MoatHO iioHflTL HSi. ero KpaTKaro onHcania, 'cea^ajia 

 no oS-feHMi, CTopoHaMT> nepBHoS och (t. e. 3aqaTKa ueuTpajibHoii 

 HepBHoii CMCTeMLj), noHBJiaroTCfl CBepxy ea neoo.iLiuia KJitTO^Hbia 

 Maccbi, ocTaiomiiacfl 3ji;'fecb 6e'3ia pa3BHTia ; onife oópasyiOT^b ko- 

 poTKin KJiifeTogHbiii mnypT. no Bepxy nepBHoii cmctcmm m cnycKa- 

 lOTca Meatjiiy eeii h upoBepTe6paMM. ^ajibme coócTBenno oht, hc 

 H3CJj'fe;i,()Baji'b pasBHTia nepBOBi., ho tIjmi. He Menfee nojiaraeTi>, 

 qTO OHH pa3BHBaK)Tca 3;i,'fecb TaKate, KaKi. y Plagiostomi, et toh 

 jiŁimb pa3HŁin,eH, irro y Teleostei nepBEi naiiHHawTt oC)pa30BaTbca 

 yjKe Tor;i,a, Kor;i,a uepBHaa ocb eKi,e t^cho coe^MKena et 9kto- 

 jiepMOMt, TaKt qT0 Bt H'feKOTopbixt ejiyyaaxt Tpy^iHO onpe;ł'fe- 

 jiHTb, npHHa;i,.ieiKHTt jih He])BHbiH 3aqaT0Kt och, hjih 9KTo;].epMy. 

 Bt 9T0Mt oócToarejibCTBt OHt ycMarpaBacTt npHMMpenie Meat^iy 

 TeopiaMH B a Ji b * y p a h T h c a , a Bt no3ii.H'feHuiHxt pa6o- 

 Taxt M a p m a JiJi a BHji,HTt apryMCHTt Bt nojibsy cBoero toji- 

 KOBania. 



Mflt Ka^KCTca, qTO TaKoe Mnifeiiie renneuw ne MM-fecTt 3a 

 ee5a BtcKMXt apryMCHTOBt. HccoMutHHO, qTO mu nojiHoil acHO- 

 CTH pa3BHTie uepH*epHqecKOH HepBHOii cHCTeMH y Teleostei ąojitk- 



HO ÓHTb H3C.lI'fe;i,0BaH0 BHOBb, HO T-fe npeuapaTbl, KOTOpbie ÓLIJIH 



Bt MOCMf, pacHopaHtemH (3apo;i,bimH oKyna) y6'fe5KjiaiOTt Mena, 

 UTO 3;i;'feeb TaKa;e, KaKt h y Cyclostomi, ni^Tt eymecTBeHHext 

 yKJiOHeniil OTt Bbime ycTanoBJieHHaro THna, h ^to noaBJienie ne- 

 pH<E>epHqecKOH HepBHoi CHCTeMbi Ha6jiio;taeTca nocjii o6oco6jieHia 



