128 



Mr, r. A. Buxton on the 



the homologies of the ascending and posterior branches of 

 the ascending trunk. 



It is probably best to consider the ascending branch as 

 forward root {vordere Wuj-zel, KUhnle ; tubercule anierieur, 



iiUf.it 



iU Kdi. 



Vxcil of 



fio. 6y. 



SiJ. S'd 



Text figure 2. — Outline drawings of the right mushroom body. 

 A, seen from the outer side (lateral view). B, from above. C, from 

 in front. (The stem and head are behind and not showii in this 

 drawing.) The line aa represents the median (sagittal) plane. 

 The cells are not shown; the whole organ as draNvn here consists 

 of axonic substance. 



as. hr. ascending branch, as. tr. ascending trunk, hd. head of 

 mushroom body. in. r. inner root. po. br. posterior branch, st. 

 stem. sw. hd. swollen head of mushroom body. sw. st. swollen foot 

 of stem. 



