EC CL QE ON QO OL 



oc 



FlG. 34A. Skull of a tailed frog towards the end of meta- 

 morphosis, x 13. 



BB, basibranchial ; BR.S, BR.4, second and fourth branchial bars; 

 CL, columella; EC, auditory capsule ; H R, ceratohyal ; MC, Meckel's 

 cartilage; oc, outline of the eye ; oc, olfactory capsule ; OL, outline 

 of lens; ON, foramen for optic nerve; Q, quadrate cartilage; QE, 

 connection of quadrate with auditory capsule ; QO, orbital process of 

 quadrate ; QP, palato-pterygoid process ; SA, stapes. 



To face p. 142. 



