POLYEMBRYONIC DEVELOPMENT IN TATUSIA 651 
Fig. 6 Median section of the inner cell-mass of specimen No. 287. X 913. 
Vig. 7 Median section of the inner cell-mass of specimen No. 310. X 918. 
Fig.8 Median section of the inner cell-mass of specimen No. 335. The letters 
a to 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 
