138 Mr. P. A. Buxton on the 



(k) A tract running up from the middle lobe into the 

 deeper parts of the protocerebral lobes which lie lateral to 

 the " loge." 



(l-q) Tracts from or to the central body, 



(1) The two capsules of the central body are united 

 especially along their anterior margin by fibres which make 

 the partitions between the " Fdcher " of the inner capsule 

 (PI. VIII, fig. 8). 



(m and mm) Both capsules are united to the protocerebral 

 lobes by bands of fibres which leave their anterolateral 

 margins ; the band from the upper capsule (m) passes 

 upwards, that from the lower {mm) downwards to the 

 ventrolateral lobes (PL VIII, fig. 7). 



{?i) The outer capsule receives fibres which leave or 

 possibly enter the head of the mushroom body on its under 

 side. This is really a part of tract r. 



(o) A few fibres connect the outer ca^Jsule to the bridge. 



(p) A few also pass from the ocellary nerve to the outer 

 capsule. 



(q) A well-marked band connects the antennary lobe 

 with the outer capsule. This band enters that part of 

 the outer capsule which lies immediately superior to the 

 posterior part of the inner capsule (PI. VIII, fig. 10). 



(r) The tract which has been mentioned on p. 126 as leav- 

 ing the inner and inferior aspect of the head of the mush- 

 room body, and passing partly to the outer capsule of the 

 central body (tract n), but mainly to the deep part of the 

 protocerebral lobes lateral and posterior to the " loge'' 

 (PI. VIII, fig. 12; PL IX, fig. 13; PL X). 



(.s- and t) These tracts pass from the ocellary glomerulus 

 to the paired deuterocerebral sympathetic system and to 

 the posterior portion of the antennary lobe respectively. 



(u) This consists of a few fibres which pass down from 

 the swollen ends of the bridge to the dorsal lobe imme- 

 diately below and to the tumulus (Plate X). 



It is, I believe, generally true that paired organs are 

 united across the middle line, but I am unable to say 

 whether this is invariably the case. 



Summary. 



The protocerebrum of Micropteryx might be described 

 in the following terms. The neurilemma, which covers 

 the whole central nervous system in one continuous sheet, 



