PISCES 



196 



FIG. 225. Photograph of the flounder from the lower side. Half natural size. 



America. The feature from which the group takes its 

 name is the possession of a lung or lungs corresponding in 

 position to the air bladder in other fish. Gills are also 

 present, so that these fish can live either in water or on land. 



PIG. 226. Lepido siren, the South American lungfish. Photograph one fourth 

 natural size. 



