MORPHOLOGY OF CRANIAL MUSCLES IN SOME VEKTEBltATES. 227 



Text-fig. 53. 



Ivr.W. 



C4>^ "e^ Luuj . 



— ii.(u\.4Aeix,tlv 



■^H ^i>o^J^,.i{>.lVL.^^v 



Text-fig. 54. 



A^'^'/e^: 



csxL 





54. 



Text-figs. 53 and 54-. — Necturus, embryo 13 mm., transverse 

 section. Text-fig. 53 througli the fourtli branchial segment, 

 Text-fig. 54 a little more posterior. 



