Experimental Studies on Germinal Localization. 43 



Development of Egg-fragments 

 66, 67, Lower fragment, oblique section; 66, trefoil, polar lobe much too large, 

 67 resulting 2-cell stage, CD half too large ; 68, 69a,-69c, cleavage of twin frag- 

 ments, oblique section, 68 trefoil, from smaller lower fragment, 69a-69c, sym- 

 metrical cleavage of larger upper fragment, 4-cell to i6-cell stages; 70, larva 

 of 24 hours, from upper fragment of a case exactly similar to 69; 71, 72, twins, 

 oblique section, nearly equal fragments, 71, 2-cell stage of upper fragment. 72 and 

 72, 2-cell and 8-cell stages of lower fragment; 73, 74, twins, probably oblique 

 section near upper pole, 74, upper fragment, 4-cell stage, 73a, normal third cleav- 

 age of lower fragment from lower pole, 73b, resulting 8-cell stage, 73c, begin- 

 ning of fourth cleavage, formation of first somatoblast. 



