Ken YON, TJic Brain of the Bee. i6y 



branching also occurs, and gives rise to the wavy upper contour 

 shown in figs. 5 and 6. But here the fibers originate from cells 

 above the body in the median plane or from cells behind it and 

 after passing behind the body enter the cleft separating the two 

 portions, where many of them are gathered into bundles with an 

 anteroposterior course. These recall the radiating bundles seen 

 in the cups of the mushroom bodies. Other fibers also send their 

 branches into it from its outer surface (PI. XVIII). 



Just behind the inner roots of the mushroom bodies large 

 numbers of fibers seem to be given off, some of which pass 

 downwards to the neighborhood of the oesophageal foramen, 

 while others take a more lateral course (fig. 5). It is this ap- 

 pearance, which is very noticeable in preparations by ordinary 

 methods, that doubtless led Viallanes to make the assertion re- 

 ferred to. When impregnated with bichromate of silver these 

 fibers seem to originate from cells situated somewhere behind 

 the central body and, after passing over its surface and sending 

 branches in to it, to take the course described and shown so well 

 in fig. 5. Some of them are probably the neurites of a group 

 of cells whose dendritic branches form a commissure immedi- 

 diately behind the central body (fig. 9, PI. XVI) and send their 

 sub-branches into its posterior surface (Pis. XVII and XVIII, 

 cells 5 and 6). 



Another group of cells lying above the body in the me- 

 dian plane send their processes backwards over its surface and 

 after sending a branch to what will soon be described as the 

 fibrillar arch pass down behind and enter the space separating 

 the upper and lower portions of the body and branch in the form- 

 er portion (cell 2, PI. XVIII). Fibers from cells situated behind 

 the body and above the fibrillar arch also make the same con- 

 nections. Another group of fibers originating from cells above 

 the antennal lobes pass obliquely inwards to the space just be- 

 hind the lower half of the body and passing upward in front of 

 the glomerules end in the upper half. What connections are 

 made by them I have not thus far been able to ascertain. No 

 fibers passing between any portion of the central body and the 

 calices of the mushroom bodies have been seen, and whatever 



