Journal of Comparative Neurology. 



PLATE XIV. 



Fig. I. Frontal section several sections in front of the junction of the 

 roots and stalks of the mushroom bodies, showing association fibers in the me- 

 dian region, and the antennal morula. 7. Tract of fibers from cells behind the 

 stalks to the anterior root of the mushroom bodies ; tr., large trachea piercing 

 the ocellar nerves and the dorsal region of the brain, s. Median nerve of the 

 stomatogastric system ; 2, pyramid of small cells of the mushroom body. Pre- 

 pared by the formol-copper- hematoxylin method. 



Fig. 2. Frontal section through the stalks and inner roots of the mush- 

 room bodies, embracing the superior and the antero-inferior dorso-cerebral com- 

 missures. Same method as fig. i. 



Figs. J and 4. Frontal sedtion. The two anterior roots of the mushroom 

 bodies, showing the bands produced by the bushy terminations of the associa- 

 tion fibers. By a modified Weigert method. 



PLATE XV. 



Fig. J. Frontal section just behind the inner roots of the mushroom bod- 

 ies, showing the fibers radiating from the central body. By the formol-copper- 

 hsematoxylin method. 



Fig. 6. A frontal section further back, embracing the inferior optic com- 

 missure and the middle and the outer antenno-cerebral tracts. Same method. 



PLATE XVI. 



Horizontal sections, all by the formol-copper-hiematoxylin method. 



Fig. 7. Section cutting off the inner calices of the mushroom bodies and 

 embracing the superior dorso-cerebral commissure and the top of the central 

 body. c. cb. commissure of the central body. 



Fig. 8. A section at a lower level embracing the top of the fibrillar arch. 



Fig. g. A section embracing the posterior commissure of the central body 

 and passing just through the top of the lower portion of this. The "pillars " 

 of the fibrillar arch appear on either side of the light tract formed by the large 

 fibers of the ocellar nerves. 



Fig. 10. A section embracing the two inferior dorso-cerebral and the lower 

 optic commissures, and two of the posterior optic tracts. The salivary nerve 

 appears in the upper right hand corner as a light spot. 



PLATE XVII. 



Fig. II. A frontal view of the brain exclusive of the outer portion of the 

 optic lobes as a transparent object, showing the different bodies in dotted black 

 outline and the fiber tracts in colors. For an explanation of the latter see expla- 

 nation of colors. General outline and the outlines of the calices taken from a 

 camera drawing of a brain mounted in toto in balsam. The outlines of the 

 other bodies and the fiber tracts taken from sections prepared by the formol- 

 copper-hematoxylin method and reconstructed by the aid of millimeter paper 

 and by the superimposition of camera drawings. 



