166 



Herrinj 



Author's Observations. 



My own results are confirmatory of those of Mihalkovics and Kupf f er. 

 In a 4-mm. cat embryo, the youngest I have had the opportunity of ex- 



FiG. 1. — Mesial sagittal section through head of 4-mm. kitten. (Diagram.) 



a, hypophysial angle formed by buccal mucous membrane ; 6, depression in wall of cerebral vesicle where 

 the infundibulum is formed; c, blood-channel; d, anteiiur end of fore-gut or Seessel's pouch; e, head 

 of notochord ; /, upper stump of ruptured oral plate. 



amining, the appearance is that indicated in fig. 1. The oral plate (f) 

 between buccal invagination and fore-gut has just ruptured. Immediately 

 in front of the oral plate is the hypophysial angle described by 

 Mihalkovics. The anterior limb of the angle is composed of buccal 





