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Fig. 6 Median section of the inner cell-mass of specimen No. 287. X 913. 

 Fig. 7 Median section of the inner cell-mass of specimen No. 310. X 913. 

 Fig. 8 Median section of the inner cell-mass of specimen No. 335. The letters 

 a i o e indicate the entodermal mother cells. X 728. 



Fig. 9 Median section of inner cell-mass of blastocyst No. 244. X 728. 



JOURNAL OF MORPHOLOGY, VOL. 24, NO. 4 



