Fig. 8 Transection through the fenestra vestihuli of a larval Spelerpes bis- 

 lineatus 23 mm. long. A.c, arteria carotis interna; E.c, ear capsule; Fe.m., 

 fenestral membrane; O.ep., oral epithelium; Op., fenestral plate (operculum); 

 Sq., squamosum; V.h.c, vestige of the hyomandibular cleft; V.p.l., vena petroso- 

 lateralis. 



Fig. 9 Transection through the cephalic half of the fenestra vestibuli of a 

 larval Spelerpes bislineatus 19 mm. long. CL, canalis lateralis; Ec, ear capsule; 

 Fe.m., fenestral membrane; Hy., hyoid; O.c, oral cavity; O.ep., oral epithelium; 

 V.h.c, vestige of hyomandibular cleft. 



Fig. 10 Transection through the cephalic half of the fenestra vestibuli of an 

 adult Gyrinophilus porphyriticus. CL, canalis lateralis; Col., stylus columellae 

 (columella); Ec, ear capsule; Fe.m., fenestral membrane; /./., isthmus fenes- 

 tralis; Op., fenestral plate (operculum); Sq., squamosum. 



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