PLATE 4 



EXPLANATION OF FIGURES 



7 Dissection of the stomach and intestines from an 11.75-mm. opossum 

 embrj'o. Ventral view of the organs from the specimen shown in figure 5. From 

 embryo no. 154. X IS. 



'8 Dissection of the stoniuch and intestines from an 11.75-mm. pouch-young 

 of the opossum. Ventral view of the organs from the sjiecimen shown in figure 

 6. From pouch-young no. 156. X IS. 



9 Same organs as shown in figure 7 oriented to show the form of the stomach. 

 From embiyo no. 154. X IS. 



10 Same organs as shown in figure S oriented to show the form of the stomach. 

 From pouch-young no. 156. X IS. 



364 



