Kenyon, TJic B7'ain of the Bee. 169 



from but is scarcely connected with, the mass of fibrillar sub- 

 stance behind the union of the roots and stalks of the mush- 

 room bodies and passes directly across the median line through 

 the large mass of cells filling the posterior median furrow, thus 

 forming a sort of commissure described by Viallanes (g?) as 

 " le pont du lobes cerebraux." It does not form a commis- 

 sure, such as is ordinarily understood by the term, even though 

 it connects the two lateral halves of the brain, and seems much 

 better denominated by the term "gabelformiger Korper" em- 

 ployed by Cuccati ( 88) or better still by the one that I have used. 

 The central portion of the arch may be seen in figure 8, while 

 in figure 9, several sections below, the pillars upon which it rises 

 appear as two dark spots, one on either side of the enormous 

 nerves from the ocelli. 



In preparations treated with copper-sulphate and haema- 

 toxylin or by the platino-osmo-picric acid method of von Rath, 

 large nerve fibers may be distinguished passing irregularly along 

 its outer surface, and seemed to originate from cells situated on 

 both sides of the brain near its ends. Viallanes ( 87) mentions 

 fibers passing from it to the central body, a connection that as 

 already intimated my preparations with bichromate of silver 

 show to actually exist. A group of fibres from cells in the 

 median plane above the central body send each a short branch 

 that ends here in a tuft of branchlets (fig. 2, PL XVIII) and 

 then continues on down into the central body as described when 

 speaking of that structure. This short branch and its tuft-Uke 

 ending without doubt represents the dendrite and the larger 

 branch to the central body the neurite of the cells of this group. 

 Other groups situated above and both before and behind reach 

 the central body after branching in exactly the same manner. 

 Viallanes (st) supposed that possibly the structure received 

 branches from the ocellar nerves, but was far from being sure. 

 Whether his supposition is true my preparations thus far made 

 do not enable me to decide definitely, but from the fact that 

 the nerves in question seem to begin to break up or become 

 less numerous in this region and from a few indications in bichro- 

 mate of silver preparations I am inclined to think that possibly 



