Analysis of species 
Dorsal origin midway or more advanced in space between 
gill opening and vent* 
Dorsal origin at first fourth between gill opening 
and vent* 
Head 4 1/^ to vent* ogilbyi* 
• Head 4 to vent. devisi. 
Dorsal origin at first 1/3 to 2/5 between gill open¬ 
ing and vent, 
d^. Head 3 4/5 to vent; dorsal origin slightly be¬ 
fore first third in trunk. brevioeps* 
d • Head ^ to 2 1/5 to vent; dorsal origin at first 
2/5 in trunk* macropterus* 
Dorsal origin nearly midway between gill opening 
and vent* 
0 ^. Head 2 2/3 to vent; mouth cleft 2 4/5 in head, 
eye little premedian, thompsoni, 
e*^. Head 2 4/5 to vent; mouth cleft 3 2/5 in head, 
eye nearly median* malabonen sis* 
3 
e • Head 3 1/4 to vent; mouth cleft 4 in head, eye 
postmedian* 
nicholsae* 
