146 THE EMBRYOLOGY OF THE HONEY BEE 



jacent neuroblasts, one of which is seen accompanied by two of 

 its progeny. Figure 546 taken from the tritocerebrum shows three 

 parallel rows formed by the neuroblasts and their descendants. 



FIG. 54. Parts of sections through the brain of embryos, to show the 

 neuroblasts (Nbl) and their products. A is from a transverse section of 

 Stage IX, passing through the antennal 'rudiment (Ant), and shows 

 the rudiment of the deutocerebrum (sBr}. B is from a sagittal section 

 of Stage IX, passing through the tritocerebrum. C. includes a portion 

 of the dorsolateral surface of the head of an embryo of Stage X-XI, and 

 shows small spindles of two different sizes, x 600. 



