394 DEVELOPMENT OF ORGANS IN MAMMALIA. [CHAP. 



Fio. 131. 



,JZT3 



Section thkough the Internal Ear of an Embrtonic 

 Sheep 28 mm. in length. (After Bottcher.) 



B.M. dura mater ; R. V. recessus labyrintM ; //. V.B. posterior 

 vertical semicircular canal ; C utriculus ; IT.B. horizontal 



