COMPARATIVE EMBRYOLOGY 



803 



FiE- 414 —Superficial cleava&e in the centrolccithal egg of tlie bristle-tail Insect, 

 Campodik staphylinns. In A the fertilized egg appears as a nucleus surrounded 

 bv cytoplasm forming an island in the center of a yolk mass. B, C, ii.ii, stages 

 of cleavage In F the thickening on the ventral side will give rise to the blasto- 

 derm (Reprinted by permission from Outline of Comparative Embryology by 

 Richards, published by John Wiley and Sons, Inc., after Uzel.) 



