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Analysis of species 
1 
a . Synbranchinae . Gills well developed, on 4 
branchial arches. 
b 3 *. Eyes well develooed; teeth in bands; gill 
opening small; vertebrae rather numerous. 
^ynbr an^hus. 
b c '. Eyes vestigeal; teeth uni serial, minute on 
premaxillaries, well developed and obtuse 
-ly conic on palate and lower jaw; gill 
opening wide, extends upward above middle 
of side; vertebrae fewer. 
* Monopter inae. Gills vestigeal, on 3 branch- 
man. nry 
ial arches only; eyes developed; teeth in 
bands; vertebrae numerous. Monopterus, 
