SILUKOXE. CX. 301 



barbels long; black above, sides silvery, belly pure 

 white; D. I, 6; A. 22; V. 8. Rivers of Atlantic Coast, 

 N. J. to S. C. 



2. A. lophius, Cope. BIG-MOUTHED CAT. Width of 

 head 3^ in length of body; head and mou-th excessively 

 large; brown, whitish below; D. I, 6; A. 21; V. 8. 

 Potomac R., etc. 



** Caudal fin deeply emarginate, but not forked. 



3. A. confinis, (Girard) Gill. WISCONSIN BULL-HEAD. 

 Dorsal nearer adipose fin than snout; jaws equal; D. I, 

 6; A. 20. Root R., Wis. 



4. A. hoyi, (Grd.) Gill. HOY S BULL-HEAD. Dorsal 

 nearer snout than adipose fin; upper jaw longest; D. T 

 7; A. 23. Racine, Wis. (Same as preceding?) 



*** Caudal rounded or truncate when spread open (rarely very 

 slightly emarginate.) 



f Anal with 17 rays; upper jaw longest. 



5. A. pullus, (DeK.) Gill. BLACK BULL -HEAD OP 

 N. Y. Blackish above; pale beneath; size small; head 

 deep, 3 in length; depth same; D. I, 5; P. I, 7; A. 17. 

 Lakes of New York and eastward, abundant. 



ft Anal with 19 to 22 rays. 

 $ Jaws about even, or upper jaw projecting. 



6. A. atrarius, (DeK.) Gill. NORTHERN BULL-HEAD. 

 HORNED POUT. Head 4 in length; depth 4J; width of 

 head 5^ to 6; barbels long; slope nearly uniform up 

 ward from snout to the elevated base of dorsal, a 

 character not shown by any other species known to me; 

 blackish above, sides coppery, belly white, yellowish 

 forwards; size small; D. I, 6; P. I, 8; A. 20. New 

 England to Maryland and the Great Lakes, abundant; 

 the common eastern species. 



