1. 17 hrs 



2. 17 hrs 



3. 18 hrs 



4. 20 hrs 



5. 22 hrs 



6. 1 day 



i 



t 



# 



//■■ 







* 



^ 

 ^/' 



f 



y 



t 



/■' 



W 



7. 2 days 8. 2 days 



Plate IV. Normal development (living), continued 



9. 2 days 



