s 'H&t 



>** -\ 4 '-, 



\ : 



Figure 6.9a. 



Embryos from Pontoporeia af finis , collected at station 20 

 in the impacted area. Most of the embryos are abnormal, 

 and one egg (arrow) is not differentiated. 



Figure 6.9b. Normally developed embryos from the reference station (no. 15) 



111 



