330 



A. 



THE MAMMALIAN EMBRYO. 



FIG. 106. 



B. 



[CHAP. 



EMBRYO RABBITS OF ABOUT NINE DAYS FROM THE DORSAL SIDE. 



(From Kolliker.] 

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



ap. area pellucida ; rf. medullary groove ; h f . medullary plate in 

 the region of the future fore-brain ; h". medullary plate in 

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

 vesicle ; mh. mid-brain ; lili. and h'". hind-brain ; uw. meso- 

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

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

 vein ; af. amnion fold. 



