133 
Rivers and estuaries of the Indo Pacific, 
species numerous. Viviparous. 
Analysis of Species 
a . Zenarchopterus . Triangular part of upper 
jaw slightly broader than long or wide 
or wide as long. 
Triangular part of upper jaw wider than 
long. 
Fourth dorsal ray of male moderately 
prolonged, not expanded, not reaching 
hind end of fin; anal with third lobe 
(tenth ray expanded) longest.- 
-dispar. 
2 
^ . Dorsal rays uniformly low; male with 
single anal lobe, its front rays 
longest.- 
-buffonis 
Triangular part of upper jaw long as 
wide. 
; . Dorsal rays all uniformly low. 
®^. Anal rays 13 or 14; male with 
trilobate anal. 
No dark lateral blotches on body; 
male with front anal lobe 
longest.---novae-guineae, 
