3. Body eel-shaped; ventral fins absent 



American Eel 

 Ani,'nilli'(lae 



p. 69 



Body not eel-shaped; ventral fins present 4 



4. Ventral fins abdominal, inserted a considerable distance behind 

 the pectorals 5 



Ventral fins thoracic (in close proximity to the pectoral fins but 

 behind) or jugular (ventral fins anterior to pectoral fin) .... 13 



11 



