



yl^"' 





Fig. 13. - Lateral view of left first gill arch. (A) Ageneiosus ucayalensis (USNM 

 265717; right arch, reversed); {B)A. valendennesi (MZUSP 21634); 

 {C)A. n. sp. (MG 27149); {T>) A. polystictus (MG 27304). Scale: A = 1.0 

 mm; B, D = 2.5 mm; C = 5 mm. 



