Fig. 2 



Diagram showing formation of ectodermal headfold in Lebistes reticulatus (e-f), compared with 

 corrcsponding stages in Serranus atrarius (a-b), after Wilson (1891) and trout (c-d), after 

 lli nneouy (1888). Cross sections, f) oblique section to show cranio-caudal gradient (right half 



cranial to left half) 



