Fig. 3 Cross section through the otic region of the same embryo, showing the 

 nervus glossopharyngeus on the right side emerging from the foramen glosso- 

 pharyngei externum (J.g.e.) and on the left entering the otic capsule through the 

 foramen glossopharyngei internum (f.g.t.). The canalis perilymphaticus (c.per.) 

 is shown on the right side extending forward from the fissura metotica and on the 

 left side it is opening into the cavum cochleae on the median side of the latter. 

 X 15. 



Fig. 4 Cross section through the same embryo, slightly in front of the previ- 

 ous figure. The relation of the squamosum (s.) external to the quadratum (q.) 

 is shown and the arteria carotis interna (a.c.i.) and ramus communicans n. facialis 

 cum glossopharyngeo (r.c.) lying ventral to the crista substapedialis. X 15. 



767 



