Ken YON, TJie Brain of the Bee. 147 



terminations of the sensory fibers of the first class and, since it 

 bears the transferred impulse inward, may be called the den- 

 drite. Usually it is shorter than the other branch that, with 

 others of its kind, passes as a tract of fibers through the fibrillar 

 substance to the mushroom bodies, in which it breaks up 

 into a bushy or arborescent mass of branches, or to other parts 

 of the brain, where the branching is of a more open kind. 



The fibers connecting the sensory fibers of the antennal 

 lobes with the mushroom bodies are most typical of this class. 

 Others that must be classed along with them enter from the 

 optic lobes and along with them are represented in violet in the 

 diagrams. Others found connecting the central body, later to 

 be described, are doubtless to be classed here, since this body 

 seems to be in connection with the fibers of the ocelli ; but 

 owing to the unsatisfactory condition of my present understand- 

 ing of this body have been left in black. The mode of branch- 

 ing at the ends' of the dendrite is represented in fig. 15, PI. 

 XXI, while the branching terminals in the mushroom bodies 

 are shown in figs. 17, 18, 21, of the same plate. Most of these 

 fibers appear to be provided with a nucleated sheath. 



The representation of fibers found in the central body in 

 figs. 32, 37, PI. XXII, by comparison with figs. I7and2i of the 

 preceding plate, which beyond a doubt represent the receptive 

 terminations, would seem to indicate that the former are den- 

 dritic. Fig. 18, PI. XXI, shows the terminations of the neurite- 

 branches in the mushroom bodies as seen under a magnifica- 

 tion of 586 diameters. 



3. TJic cells of tJie musJirooni bodies. These fall under the 

 head of Y-shaped cells and consequently follow the class just 

 described, but will be left for consideration along with the 

 bodies which they largely compose. They are represented 

 in red. 



4. Efferent fibers which originate from cell bodies situated 

 within the brain and bear efferent stimuli to muscles, glands or 

 to cells outside of the brain are represented in the diagrams 

 in brown. The cells of this order seem to depart widely from 

 the simple T-shaped general type as is shown in fig. 36, PI. 



