PLATE 3 



EXPLANATION OF FIGURES 



Drawings from wax models of the ear capsule of Amphiuma means. 



27 Embryo 30 mm. long. 



28 Young adult 85 mm. long. 



29 Adult 265 mm. long. 



ABBREVIATIONS 



Col., stylus columellae (columella) Ps., parasphenoid 



I.f., isthmus fenestralis Sq., squamosum 



Op., operculum (fenestral plate) V.a., ventral arm of isthmus fenestralis 



380 



