46 
otphæb, Euselachii. 
KOHe^HOCTeîi ©ctb. ÜJiaBHHKOBEre JiynH poroBBie, no^epmHBaeMue 
xpaiiiieBHMH CKejreTHHMH ajieMeHTaMH (radialia hjih nTepnrio(|»opij). 
Ko;Ka noKpuTa njiaKOH^HHMH uemyHMH (kojkhbimh 3y6aMH) hæh 
ronan. ÜCadepHEte jienecTKH npHKphnjraioTCJi kb> MeawKaôepHOH 
neperopo^K’i Bceii CBoen æjihhoh. ApTepianBHBiH KOHycB, cb> hL- 
ckohbkhmh pB^aMH K^anapoBB,. Bcer^a ecTB cnnpajiBHBiH KJianaHB, 
bb> Kiime'qHHK'Ê. ILiaBaTejiBHaro ny3Bipji hLtb» (hjih ecTB 3aHaTOH- 
hhh). OpraHBi o6ohhhlîi bb, bh^ napHHX'B cjrhnBiXB, mLihkobb,, 
Kaae^HH CB, OJÇHHMB, HapyJKHHMB, OTBepCTieMBï. SpHTeJIBHBie HepBBI 
o6pa3yiOTB> xia3My. CaMn;Bi cb, coBOKymrrejiBHBiMB, opraHOMB, 
(pterygopodia hjih mixopterygia), pa3BHBaK>m;HMCH H3B> 6pioniHEixB> 
nJiaBHHKOBB, *). CaMKH HJIH aCHBOpOÆJIIIliiH, HJIH OTKJia^HBaiOT'B 
KpynHEiB BHn;a. 5ÏHn;eBo;n;Ei He coe^HHeHEr cb> hhhhhk aMH, OTEppi- 
BaBCB bb, nojrocTB Tijia ninp okhmh OTBepcTinMH. 
Selachii pa3,n;hjLaK)TCH Ha æbL ph3KO pa3JiHHHEiH rpyiinu: 
I. Trematopnea cb, ueTEipBMJï OTpH^aMH, H3B> kohxb, nepBBie 
Tps BBiMepmie : 1) oTpH^B, Pleuropterygii (cen. Cladoselachidae h Cla- 
dodontidae ), 2) 0 Tpn;n,B, Acanthodea (c©m. Acanthoessidae h Diplacan- 
tliidae ), 3) OTpa^B, Ichthyotomi (cgm. Pleuracanthidae), 4) 0 Tpa^B> Euse¬ 
lachii (hbihL HCHBymie Trematopnea); 
IL Chasmatopnea cb, oæhhmb, otphæomb, Holocephali , 3aKjno- 
naioni;HMB> o^ho hbihL JKHBym,ee ceM. Chimaeridae n 4 HCKonaeMEixB,. 
no BHLmHeMy BH,n;y OTpa^H Euselachii h Holocephali ûkibcho 
pa3jmnaTB TaKB>: 
a. HapyacHErxŒ, æa6epHtix r i> OTBepcTifi ci» Kaæaoâ CTopoHH 5— 7 . . 
.... Euselachii. 
aa. HapyæimxTb acaôepHtix'B oTBepcrin CŒ, sas^oâ CTopoHH ohho . . 
.... Holocephali. 
Otphab, III. Euselachii (Plagiostomata). 
Palato-quadratum He cjihto cb, uepenoMB,. 3Ka6epHEiH m;ejiH 
OTKpHBaBDTCH npflMO HapyîKy, HHCJIO HXB, 5-7 CB, KaaC^OH CTOpOHH, 
acadepHOH KpnimKH hLtb,. Ectb KJioaKa 1 2 ). 
^Ba no^oTpn^a : Selachoidei h Batoidei. 
1) y HCKonaeMux'i» otphæob'b Pleuropterygii h Acanthodea, noBH,nH- 
MOMy, nTepHrono^ifi He 6 bljio. 
2) JLih OTJiH^ia oi”£ ECKonaeMnxi. OTpHffOB'B HyæHO npnâaBHTB em;e, 
^to CK.ejieT’B napHux'B iuiaBHHKOBT» HHKor^a He 6h BaerB nocTpoeH’B no 
6ncepiajitHOMy Tnny; xopsa dojrfce hjih MeH-he nojiHO 3aM^ni;aeTCH ho3boh- 
xaMH; intercalaria ecTt; nTepHronoftin y caMna ecTB. 
