330 



THE MAMMALIAN EMBRYO. 



Fia. 106. 



B. 



[chap. 



Embeto Babbits or about Nine Days from the Doksal Side. 



(From Kelliker.] 



A. magnified 22 times, and B. 21 times. 



op. area pellucida ; rf. medullary groove ; h'. medullary plate in 

 the region of the future fore-brain ; A", medullary plate in 

 the region of the future mid-brain ; vh. fore-brain ; db. optic 

 vesicle ; mh. mid-brain ; hh. and K". hind-brain ; v/m. meso- 

 blastic somite ; stz. vertebral zone ; pz. lateral zone ; kz. and 

 h. heart ; ph. pericardial section of body-cavity ; vo. vitelline 

 vein ; af. amnion fold. 



