Kenyon, The Brain of the Bee. 209 



PLATE XVIII. 



Fig, 12. A thick horizontal section embracing the region from the base of 

 the inner mushroom bodies to the middle of the optic bodies. Outlines from 

 formol-copper-hcematoxylin sections as in fig. ii. 



PLATE XIX. 



Fig. ij. The remainder of the brain below that represented in fig. 12. 

 Outlines from sections as in fig. 12. 



PLATE XX. 



Fig. 14. The lateral half of the brain viewed in optical sagittal section 

 from the median plane outward. Outlines from thick sections prepared by the 

 Golgi method. 



PLATE XXI. 



Cells and fibers from camera drawings of bichromate of silver preparations. 



Fig. ij. Cells and fibers from the antennal lobe, x 121. 



Fig. lb. Fibers from the antennal nerve and an olfactory body. In the 

 section the right hand branch of the upper fiber was found, after the drawing 

 here was made, to end in a small tuft of branches forming a portion of a glom- 

 erula. x 121. 



Fig. //. Terminations of an association fiber in the junction of the stalks 

 and roots of the mushroom bodies, x 121. 



Fig. iS. Cells and fibers of the mushroom bodies, x 102. 



Fig. ig. Cell bodies of the same, x 121. 



Fig. 20. An olfactory glomerula formed by the termination of a fiber of 

 one of the antenno-cerebral tracts. 



Fig. 21. The terminations of association fibers in the anterior root of the 

 mushroom bodies. 



Fig. 22. A fiber passing across the top of one of the anterior roots and 

 branching profusely in the region just inside of it. Some of the branches seem 

 to penetrate the root. 



Fig. 2j. Fibers terminating in the calices entering about the origin of the 

 stalk. 



Fig. 24. A drawing from three superimposed sagittal sections embracing 

 the region from near the median line to the outer side of the anterior root, g, 

 cells on the outside of the antennal lobe ; above them and obscuring their fibers 

 is a mass that may be composed of several over impregnated cells just above the 

 antennal morula. For the rest see the diagrams in plates XVII to XX. 



Fig. 2j. Fiber entering an anterior root and apparently fusing with the 

 parallel fibers. See text, p. 161. 



Fig. 26. The smaller kind of fibers terminating in the calices. z 102, 

 See text, p. 157. 



