206 



VITAL STAINING AND MORPHOGLNETIC MOVEMENTS 



LENS 



NEURAL FOLD 

 EAR 



LIMIT OF HEAD REGION 



LIMIT OF INTURNED, 

 MATERIAL 



VISCERAL POLICHES 

 '^ANTERIOR LIMB BUD 



LIP OF BLASTOPORE 



LIP OF BLASTOPORE 



POSTERIOR -DORSAL VIEW 



RIGHT SIDE VIEW 



PRESUMPTIVE REGIONS OF ANURAN BLASTULA 



(ADAPTED FROM VOGT: 1929) 



MARGIN OF INUVQINATION 



ECTODERM 



iPLANCHNIC MESODERM 



VENTRAL 

 POSTERIOR (BLASTOPORIC) VIEW 



REGION OF DORSAL UP 



RIGHT see VIEW 



PRESUMPTIVE REGIONS OF URODELE BLASTULA 



(ADAPTED FROM VOGTI 1929) 



