FISHERY BULLETIN: VOL. 78, NO. 2 



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Figure 9. — Smallest (2 mm) normal embryo at arrow with long, filmy placental membranes (no. 3, Table 4). 



Figure lO. — Five mm embryo (arrow) with huge placental membranes (no. 9, Table 4). 



The cells of the corpus luteum of all of these 

 animals were well supported, and the central 

 fibrin clot was invaded by vessels and fibroblasts 

 in all but one animal (no. 3, Table 4; Figure 9). 

 This was also the smallest embryo other than that 

 of the aberrant right specimen (no. 1, Table 4). Its 



514 



corpus luteum is showoi in Figure 11 and is readily 

 distinguishable from the small luteal mass found 

 in the experimental group. 



The endometrium had characteristic changes 

 that should allow the histologic diagnosis of early 

 pregnancy. First, the tips of endometrial folds be- 



