PLATE o 



EXPLANATION OF FIGURES 



11 Photograph of a section of the stomach of the kite opossum embryo. The 

 position of this section and those shown in figures 12 and 13 are indicated in fig- 

 ure 3. From section 83 of embryo no. 154. X 25. 



12 Photograph of section 2;.3. From embryo no. 154. X 25. 



13 Photograph of limb 5 in section 254 of the small intestine. From embryo 

 no. 154. X lot). 



14 Photograph of section 128 of the early pouch-young. The positions of 

 the sections in the series are indicated in figure 4. From pouch-young no. 156. 

 X20. 



15 Photograph of section 195. From pouch-young no. 156. X 20. 



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