72 LIBBIE H. HYMAN. 



PLATE III. 



FIG. 37. Four stages in the disintegration of a later embryo of Fundultts. 



FIG. 38. Three stages in the disintegration of an embryo of the cod after 

 the formation of the optic vesicles. 



FIG. 39. Four stages in the disintegration of an embryo of the cod shortly 

 before the closure of the germ ring. 



FIG. 40. Four stages in the disintegration of an embryo of the cod after 

 the closure of the germ ring. 



