1 66 Journal of Comparative Neurology. 



out anteriorly, some posteriorly, or, in short, as a center of 

 disassociation. 



The body throughout my diagrams and figures is distin- 

 guished by the letters c.b. 



In the honey bee this body as a whole has a very much 

 distorted spherical shape. In frontal sections the fan-shape 

 described by Dietl and Berger is apparent (fig. 5), though the 

 outline presented might be better described as reniform. Viewed 

 from above or in horizontal sections it has a somewhat trape- 

 zoidal outline. 



Internally, as shown by sections in the frontal plane, it is 

 divided by a space filled with nerve fibers and tracheae, into an 

 upper and larger portion covering a lower and smaller portion. 

 Both are seen in preparations by ordinary methods to be corn- 

 posed of fibrillar substance, but in frontal sections the lower 

 usually stains more deeply (fig. 5). Antero-posteriorly the 

 upper portion is also much the larger and considerably over- 

 hangs the other, partly covering two masses of fibrillar substance 

 a little farther on to be described as tubercles. 



Taken as a whole, fibers seem to reach it from or leave it 

 in nearly all directions ; but the two parts seem to be supplied 

 somewhat differently. Those entering the lower are seen to 

 originate from cells above the antennal lobes and upon reaching 

 the lower lateral edges to take a transverse course below the body 

 and send several branches upwards that subdivide arborescently 

 producing a compact mass of branchlets that recall the arborescent 

 and bushy terminations of the association fibers in the roots, of 

 the mushroom bodies (figs. 32 and 37). As in the case of these 

 latter fibers, it is to the compact branching mass of fibrills 

 that is due the depth of color so noticeable in preparations 

 stained with osmic acid or with hcematoxylin. Other fibers 

 either pass out or enter from the fibrillar substance of the brain 

 immediately in front, while branches from association fibers in 

 the anterior region seem to enter the anterior end and the 

 posterior lower end of this portion of the body (fig. 40, PI. 

 XXII). 



In the upper portion the same arborescent method of 



