78 



H. L. Bruner 

 Fig. 10. 



Amphiuma tridactylum. Transverse section through the anterior part ofthechoanal canal. ac aut- 

 orbital cartilage; n choanal canal; mx maxillare. 



Fiff. 11. 



dc4i2. 



°% '"*** ;/^. _x 



•<-ä 







Amphiuma tridactylum. Transverse section through the choana, ac antorbital cartilage; de m. dor« 

 salis choanae; Ic m. lateralis choanae; «es maxillare; pa parietale. 



