EMBEYOLOGY OF THE LOWER VERTEBRATES CH. 



ovale) becomes closed so that the blood arriving in the right auricle 

 can only reach the left auricle by the circuitous route through the 



ra. 



as 



Fl<;. 246. I)i .-.ti-.jis from tin- ri-lit .sid<- showing the ^i-m-ial aiTan^fiiinit ul' tlic \i 



a Fowl <-n.l.i\u at th- i-ii.l of tin- liith (A . sixth (Hi, and eighth (' ,la\s ..r in.-ul.-iti.n 



!'ilinii;il ;ni -s.'ic ; nil, alliintuis ; ,-.n, > ,, , . rio-riiiii ; /_ -i//;ip| ; //, ljv>r; 



ii !<!.; ,-./. riK'lit lull.-; /' \cntrn-lr; :l ik ; f.f, yoU 



right ventri-lr ;ml ]Milni(.n;iry circiilal ion, and llic allant iic, vein, 

 duct ul' I'.'il.'illiis, and diic.lu.s \cii(sus in MM- livT I'rroinr nl i|j I era 1 rd. 



