Percoidea, or Perch-like Fishes 



295 



tion of the vent. In the adult this is in front of the ventral 

 fins, at the throat. In the young it is behind the ventral fins 



FIG. 228. Pirate Perch, Aphredoderus sayanus (Gilliams). Illinois River. 



as in ordinary fishes. With age it moves forward by the pro- 

 longation of the horizontal part of the intestine or rectum' 

 The same peculiar position of the vent is found in the berycoid 

 genus Paratrachichthys. 



In the family Aphredoderida but one species is known, 

 Aphredoderus sayanus, the pirate-perch. It reaches a length 



FIG 229 Everglade Pigmy Perch, Elassoma evergladei Jordan. Everglades of 



Florida 



of five inches and lives in sluggish lowland streams with muddy 

 bottom from New Jersey and Minnesota to Louisiana. It is 



