PERCIDiE. 



201 



tho back. Eyes large, circular near the facial outline. Nostrils 

 double ; mouth small, with very minute thick-set teeth on the maxil- 

 laries, palatines and vomer. 



Its dorsal fin has ten spinous and twelve soft rays, pectorals twelve 

 soft, ventrals one spine and five soft rays, anal three spinous and five 

 soft, caudal seventeen soft rays. 



There is another well-defined species, the Black-eared Pond-fish, 

 Pomotis Appendix, which is distinguished by a large lobe-like black 

 prolongation of the upper posterior angle of the operculum. 



