BuL. U. S. B. F., 1908. 



Plate CXIX. 



. II. — Male horned dace picking up a 

 stone. His lips are grasping it. 



Fig. 12. — Male horned dace ahout to drop a 

 stone which he carries in his mouth. 



Fig. 13. — Male horned dace which has just 

 dropped a stone, but has his mouth still 

 open. 



14.— Male horned dace pushing along the 

 bottom a stone too big to carry. 



