162 



Inez Whipple Wilder. 



Fig. 6. — Transverse section throngli the anterior nasal region of an adult 

 Cryptobranchus allegheniensis. Abbreviations as in previous figures. 



Fig. 7. — Frontal section through the anterior portion of the nasal cavity 

 of an adult Cryptobranchus allegheniensis. Abbreviations : ant, external naris ; 

 cc, cross section of the constrictor naris muscle- dlo, origin of the dilatator 

 muscle; Idl, longitudinal section of the dilatator muscle. Other abbrevia- 

 tions as in previous figures. 



