PLATE 2 



EXPLANATION OF FIGURES 



Drawings of wax models of the ear capsule and sound-transmitting apparatus 

 of Spelerpes bislineatus. 



23 Larva 25 mm. long. 



24 Larva 28 mm. long. 



25 Larva 34 mm. long. 



26 Mature larva 34 mm. long. 



ABBREVIATIONS 



Col., stylus columellae (columella) 

 C.S., level of text figure 5 

 D.a., dorsal arm of isthmus fenestralis 

 growing into the fenestral membrane 

 B.C., ear capsule 



I.f., isthmus fenestralis 



Op., fenestral plate (operculum) 



S., level of text figure 4 



Sq., squamosum 



Va., ventral arm of growing isthmus 



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