SOUND-TRANSMITTING APPARATUS OF CAUDATA 



335 



Fig. 3 Transection through the cephalic portion of the fenestra vestibul o 

 a larval Spelerpes bislineatus 20 mm. long. C.I., canahs lateralis; f^.J^'oi 

 the fenestra vestibuli growing dorsad into the fenestral membrane o form the 

 sthmus fenestraUs and to contribute to the formation of the fe-s - plat^- f - 

 ear capsule; F.ern., fenestral membrane; Hy., hyoid; O.c, oral cavity, V.h.c, 



^'l^f^r:^:^:':^:^^^ fenestra vestibuli of a l-al Spelerpes bi 

 lineatus 31 mm. long. CoL, columellar stylus d..., ^dv-cing edge of he^i^^^^ 

 mus fenestralis; Ec, ear capsule; Fe.m., fenestral membrane, O.c, oral cavity, 

 . O.ep., oral epithelium; V.h.c, vestige of hyomandibular cleft. 



