PLATE 1 



f:XPLAXATIOX OF FIGURES 



5 Three quarter view of model of skull of 33 mm. larva from the right side. 



6 Dorsal view of above model. Drawn to smaller scale than figures 5, 7, 8. 



7 Dorsal view of model of brain of unilaterally operated 33 mm. larva. 



8 Three quarter view of model of skull of unilaterally operated 33 mm. larva 

 from left side. 



ABBREVIATIONS 



ao, antorbital process 



(ip, anterior trabecular plate 



'ipm, ascending process of premaxilla 



bp, bony plate connecting premaxilla 



and maxilla 

 rt, crista trabeculae 

 ec, ethmoid column 



fo, fenestra olfactorius 



m, maxilla 



mp, medial nasal process 



■jmi, premaxilla 



sn, solum nasi 



t, trabecula 



tc, tectum nasi 



52 



