PL.ATE 13. 



Fig. 19— a mi urns erebennns Jordan. 

 St. John's K., Pla. From type. 



Fig. 20— Amiurus erebennns Jordan. 

 St. John's II., Fla. From type. 



Fig. 21— Amiirrus natalis (Le S.) Gill. 



(Var. natalis ) 



Lake Erie. 



