47o 



TELE OS TBI 



Fig. 498. 

 Restoration of Amphistium paradoxum, Ag. ; Upper Eocene. (After Boulenger.) 



Fig. 499. 



Enlarged views of three .successive stages in the development of Pleuronectes platessa, I.. 

 (After Cole and Johnstone.) Stages A and B are still symmetrical, a, anus ; o.f, anal lin ; d.J, 

 dorsal lin ; e, ear ; In/.f, hypochordal caudal fin ; I, left eye, which migrates ; p.f, pectoral fin ; 

 r.f, right eye, which remains on the ' ocular ' side ; y.s, yolk-sac. 



