PLATE 2 



EXPLANATION OF FIGURES 



Figures 10 to 16 are taken from a series of frontal sections of the head of the 

 queen of Lasius niger, beginning at the anterior end. The fibrous core is mottled, 

 the nerve cell layer is blank. Oc. 4, AA, Zeiss, stage level. 



10 Section through the anterior part of the protocerebral lobes, p.l., and the 

 antennary lobes, a.l., anterior to the mushroom bodies. 



11 Section through the anterior part of the mushroom bodies, and showing 

 the origin of the labro-frontal nerve, l.fn., from the antennary lobe. 



12 Section through the stalks, st, of the mushroom bodies, and the anterior 

 dorsal protocerebral commissure, a.cin. 



562 



