THE EMBRYOLOGY OF THE HONEY BEE 131 



Fig. 49. Transverse sections through developing ventral cord. A, 

 region between the first and second thoracic segments, Stage IX ; B, first 

 mandibular segment, Stage X ; C, first thoracic segment, Stage X ; D, 

 posterior region of second thoracic segment, Stage X, x 600. 



especially since the ganglion cells are very r-imilar to those of 

 the mesoderm. 



