Kenyon, TJic Bram of the Bee. 193 



fibrillar connections within the brain, I have not as yet been 

 able to learn. Not many preparations were obtained show- 

 ing them passing out of the ganglia, and in fact only one in 

 which they could be traced from below the calices, and from 

 this the two fibers of the figures were taken. 



As there are no muscular structures in the ganglia, their 

 function is doubless to control the action of the pigment of the 

 pigment cells. 



The Commissural and Ventro-cerebral Region. 



Since in the case of the bee they are so closely bound to 

 it, the parts composing the oesophageal commissures may be 

 considered along with the ventro-cerebron. 



As already pointed out, the trito-cerebral lobe is very much 

 reduced and is mainly distinguishable externally by the labral 

 nerve. This is not far behind the internal antenno-motor nerve 

 and its r^ot may be traced for a short distance in^o a small lobe 

 just inside the neck of the antennal morula. Fig. 2 is just a 

 little too far forward to show it, but a section of the nerve may 

 be seen on the left at its point of entrance. In bichromate of 

 silver preparations the fibers entering from it very quickly form 

 a bushy tuft of branches just beneath the root of the antenno- 

 motor nerve. Some of these reach back into the ventro- 

 cerebron. 



The roots of the other oral nerves may be followed in or- 

 dinary prcparatious each as a light band of fibers that passes 

 upward above the point of entrance of the nerve and then bends 

 inward towards the median line and ends in a roll of fibers that 

 is apparently much more easily distinguishable in other forms 

 than in the bee, and which Binet ( 94) calls the ventral column. 

 This passes backward into the ventral cord. The two roots that 

 Binet describes for each crural and each ventro-cerebral nerve 

 in Ceranibyx and other beetles I do not find in my sections of 

 the bee's ventro-cerebron. This may be due to their being 

 fused, but the attention that I have given this portion of the 

 brain is as yet small in comparison to that given the dorso- 

 cerebron. 



