460 
p 
f~'» Vent far postmedian; vertical fins low 
feeble folds, rays feeble and distinct 
only at end of tail; pectorals short, 
vestigial or absent; teeth uni serial. 
Rabouridae. 
2 —— — 
a', Colocephall, Gill openings small, rounded, lead¬ 
ing to restricted interbranchial slits; tongue 
absent; opercles feebly developed; pectorals 
usually absent. Echidnidae. 
% 
