liSiire 1. Shows two bundles of developing muscle fibrils from an embryo of 

 Zoarces vtinpara 28 m.m. long. In the upper part of the one to the left can be 

 seen Dobie's line (the thin dark line in the middle of the clear zone) and 

 Hensen's line (narrow clear band in the middle of the dark zone). X 3000. 



Sec. IV, 7A 



