50 



spine. Adipose fin subpedunculated and thick. Caudal fin forked, 

 and inserted on the equally convex extremity of the caudal peduncle. 

 Ventral fins with eight rays. 



Genus Amiurus (Raf.) Gill. 



SYNONYMY. 



Silurus sp. Linn^ auct. 



Pimelodus sp. Raf. Ichthyologia Ohiensis. 



Ictalurus sp. Raf. Ichthyologia Oliiensis. 



Amiurus Raf Ichthyologia Ohiensis, p. 65. 



Pimelodus sp. auct. 



Type Amiurus catus Gill. 



Syn. Pimelodus catus Lac. 



Body rather stout and robust. Head depressed, oval, and with the 

 periphery of the snout rounded, covered with a thick skin. Supra- 

 occipital bone posteriorly free. Branchiostegal membrane with seven 

 to nine rays. Mouth wide. Anterior dorsal fin with a stout serrated 

 spine. Adipose fin subpedunculated and thick. Caudal fin not 

 forked ; the end of the caudal peduncle equally convex. Ventral fins 

 with eight rays (1.7). 



Genus Noturus Raf. 



SYNONYMY. 



Silurus sp. Mitch ill. 



Noturus Raf American Monthly Magazine and Critical Review, 

 vol. III. p. 41. Nov. 1818. 



Noturus Raf Prodrome de soixante-dix nouveaux genres d'Animaux 

 decouvertes dans I'interieur des Etats Unis en 1818 ; ib. in Jour- 

 nal de Physique, vol. Lxxxviii. 1, p. 421. June, 1819. 



Noturus Raf Ichthyologia Ohiensis, p. 67. 



Noturus Raf Kirtland, Storer, Baird. 



Pimelodus sp. Cuv. et Val. Storer, Blether. 



Schilbeoides Bleeker, Acta Societatis Sclentiarum Indo-Neder- 

 landicae, vol. iv. 258. 1858. 



Body rather stout and robust. Head depressed, oval, covered with 

 a thick skin, with a median longitudinal and transverse nuchal 

 groove. Supraoccipital bone posteriorly free. Mouth wide. Bran- 

 chiostegal membrane with seven to nine rays on each side. Anterior 

 dorsal fin with a short, smooth, and acuminated spine. Adipose fin, 

 cariniform, elongated, and compressed, generally united with the 

 .procurrent rays of the obliquely truncated caudal fin. Caudal pedun- 

 cle with the extremity obliquely subrotundate, truncated downwards 

 and forwards. Ventral fins with nine rays (1.8). 



Type Noturus flavus Raf 



