318 ADDENDA. 



quite obscure. Occasionally the body is almost orbicular 

 in form, the profile being nearly vertical. Some speci- 

 mens have the belly strongly tinged with orange red. 



(Page 300.) 



" Ictalurus nigricans." The great Fork-Tailed Cat- 

 Fish of the Lakes, mentioned in the text under the above 

 name, is an Amiurus, and should stand as Amiurus nigri- 

 cans, (LeS.) Gill. 



A specimen two feet long, taken in Lake Michigan, 

 shows the following characters : Tail strongly forked; 

 supra-occipital bone free behind; head small, 4^ in 

 length, its width 5; upper jaw much longer than lower; 

 barbels very long, longest reaching much beyond 

 opercle; body heavy and deep, the depth being about 

 4 in length; body wider than head; dorsal outline ele- 

 vated; color blackish, somewhat mottled, white below; 

 D. I, 6; P. I, 10; A. 25. (A. nigricans of Giinther and 

 of Cope is described as having the caudal fin truncate 

 which it certainly is not in this species.) 



