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TEXT-BOOK OF EMBRYOLOGY. 



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FIG. 90. Human embryo of 15.5 mm. (39-40 days). His. 



FIG. 91. FIG. 92. FIG. 93. 



FIG. 91. Human embryo of 17.5 mm. (47-51 days). His. 

 FIG. 92. Human embryo of 18.5 mm. (52-54 days). His. 

 FIG. 93. Human embryo of 23 mm. (2 months). His. 



