118 



1M:K( 1\ AL HAILEY 



ted 



Fig 25 Median view of a model of the region around the foramen mterven- 

 triculare from the 32 mm. embryo, H 41. X 50. (The entire forebram of this 

 embryo is shown in figure 22.) The model was made at a magnification of 100 

 diameters. Anterior end to the left. 



